TARA

Expect to complete enrollment of the BCG-Unresponsive registrational cohort of the ADVANCED-2 trial in 4Q 2026 The ADVANCED-3 trial is being redesigned as an exploratory trial to expand into and accelerate data in high-grade, high-risk BCG-Naïve and BCG-Exposed CIS (± Ta/T1) patients and papillary (Ta/T1) patients across BCG exposures Expect to provide an update and complete enrollment of the STARBORN-1 trial in LMs in 4Q 2026; expect to submit a Biologics License Application for TARA-002 in LMs in 2H 2027 On track to report interim results from THRIVE-3 registrational trial of IV Choline Chloride in patients dependent on long-term parenteral support in 4Q 2026 Cash, cash equivalents and investments of approximately $162 million as of June 30, 2026, expected to support planned operations into 2028 NEW YORK, Aug. 11, 2026 (GLOBE NEWSWIRE) -- Protara Therapeutics, Inc. (Nasdaq: TARA), a clinical-stage biotechnology company developing transformative therapies for the treatment of cancer and rare diseases, today announced financial results for the second quarter ended June 30, 2026 and provided a business update. “In the second quarter, we strengthened our late-stage pipeline through continued operational execution, positioning us for multiple important milestones over the coming quarters,” said Jesse Shefferman, Chief Executive Officer at Protara Therapeutics. “We continue to make progress in the ADVANCED-2 trial and expect to complete enrollment in the fourth quarter of 2026. We remain confident that TARA-002 will be a preferred treatment option in the non-muscle invasive bladder cancer (NMIBC) BCG-Unresponsive setting, and we are redesigning ADVANCED-3 to be a multi-cohort, open-label, exploratory trial, which will allow us to study TARA-002 in a broader high-grade, high-risk NMIBC patient population. The redesigned ADVANCED-3 protocol is expected to accelerate and expand the breadth of data available at or around the time of the potential launch of TARA-002 in BCG-Unresponsive carcinoma in situ (CIS) patients.” Mr. Shefferman added, “We also advanced our rare disease programs during the quarter. We recently presented encouraging interim durability and safety data from the STARBORN-1 pivotal trial of TARA-002 in Lymphatic Malformations (LMs) and, following discussions with the FDA, expect to submit our Biologics License Application (BLA) in the second half of 2027. At the same time, enrollment in the THRIVE-3 registrational trial evaluating IV Choline Chloride continues as planned, with interim results expected in the fourth quarter of this year. As we continue to execute across our portfolio, we believe we are well positioned to deliver a series of important clinical, regulatory and operational catalysts that have the potential to create meaningful value for patients and shareholders.” Recent Progress and Highlights TARA-002 in NMIBC The Company expects to complete enrollment of the BCG-Unresponsive cohort in the fourth quarter of 2026. The Company is redesigning the recently initiated ADVANCED-3 trial to be a multi-cohort, open-label, exploratory trial to evaluate the efficacy and safety of intravesical TARA-002 in high-grade, high-risk BCG-Naïve and BCG-Exposed CIS (± Ta/T1) patients and papillary (Ta/T1) patients across BCG exposures. Importantly, this new design allows Protara to accelerate and expand the breadth of TARA-002 data in a broader high-grade, high-risk NMIBC patient population. TARA-002 in LMs Protara presented updated interim safety and durability data from the ongoing Phase 2 STARBORN-1 trial evaluating TARA-002 in pediatric patients with macrocystic and mixed cystic LMs in a poster session at the International Society for the Study of Vascular Anomalies World Congress in Philadelphia, Pennsylvania. As of an April 10, 2026 data cutoff: Based on engagement with the FDA under Breakthrough Therapy designation, the Company intends to submit a BLA for TARA-002 in LMs based on the results of the pivotal STARBORN-1 trial in the second half of 2027 and will continue to submit safety and efficacy data from the trial on an ongoing basis to support the FDA’s evaluation of the risks and benefits of TARA-002 in LMs. IV Choline Chloride for Patients on Parenteral Support (PS) THRIVE-3, the Company’s registrational Phase 3 clinical trial, is ongoing, and the Company expects to report interim results in the fourth quarter of 2026. Second Quarter 2026 Financial Results As of June 30, 2026, unrestricted cash and cash equivalents and marketable debt securities totaled $161.9 million. The Company expects its cash and cash equivalents and marketable debt securities will be sufficient to fund its planned operations and milestones into 2028. Research and development expenses for the second quarter of 2026 increased to $17.0 million from $10.8 million for the prior year period. This increase was primarily due to higher direct costs associated with ongoing clinical trials of $3.2 million, increased personnel-related expenses of $1.8 million and increased non-program specific research and development expenses, primarily attributable to chemistry, manufacturing and controls of $1.2 million. General and administrative expenses for the second quarter of 2026 increased to $6.4 million from $5.8 million for the prior-year period. The increase was primarily due to an increase in personnel-related expenses of $0.7 million, offset by a decrease in other general and administrative expenses of $0.1 million. For the second quarter of 2026, Protara incurred a net loss of $21.7 million, or $0.36 per share, compared with a net loss of $15.0 million, or $0.35 per share, for the prior-year period. About TARA-002 TARA-002 is an investigational cell therapy in development for the treatment of NMIBC and of LMs, for which it has been granted Rare Pediatric Disease, Orphan Drug, Breakthrough Therapy and Fast Track designations by the FDA. TARA-002 is a first-in-class TLR2/NOD2 agonist and novel immunopotentiator derived from inactivated Streptococcus pyogenes with a mechanism of action that includes the activation of innate and adaptive immune pathways within the bladder wall. When TARA-002 is administered, it is hypothesized that innate and adaptive immune cells within the cyst or tumor are activated and produce a pro-inflammatory response with the release of cytokines such as tumor necrosis factor (TNF)-alpha, interferon (IFN)-gamma, IL-6, IL-10 and IL-12. TARA-002 also directly kills tumor cells and triggers a host immune response by inducing immunogenic cell death, which further enhances the antitumor immune response. TARA-002 was developed from the same master cell bank of genetically distinct group A Streptococcus pyogenes as OK-432, a broad immunopotentiator marketed as Picibanil® in Japan by Chugai Pharmaceutical Co., Ltd. About Non-Muscle Invasive Bladder Cancer Bladder cancer is the sixth most common cancer in the United States, with non-muscle invasive bladder cancer (NMIBC) representing approximately 80% of bladder cancer diagnoses, or approximately 65,000 patients in the U.S. each year. NMIBC is cancer found in the tissue that lines the inner surface of the bladder that has not spread into the bladder muscle. Patients suffering from high-grade, high-risk NMIBC face high rates of disease recurrence and are potentially subject to full removal of the bladder (cystectomy). About Lymphatic Malformations Lymphatic Malformations (LMs) are rare, congenital malformations of lymphatic vessels resulting in the failure of these structures to connect or drain into the venous system. Protara’s focus is on macrocystic and mixed cystic LMs, for which there are no currently approved therapies. More than 50% of LMs are detected at birth and 90% diagnosed before the age of three years. The most common morbidities and serious manifestations of the disease include compression of the upper aerodigestive tract, including airway obstruction requiring intubation and possible tracheostomy dependence; intralesional bleeding; impingement on critical structures, including nerves, vessels and lymphatics; recurrent infection; and cosmetic and other functional disabilities. TARA-002 has been granted Rare Pediatric Disease, Orphan Drug, Breakthrough Therapy and Fast Track designations by the FDA for the treatment of LMs. About IV Choline Chloride for Patients on Parenteral Support IV Choline Chloride is an investigational, intravenous phospholipid substrate replacement therapy in development for patients receiving parenteral support (PS). Choline is an important substrate for phospholipids that are critical for healthy liver function and play an important role in modulating gene expression, cell membrane signaling, brain development and neurotransmission, muscle function and bone health. There are currently no available PS formulations containing choline. IV Choline Chloride has the potential to become the first FDA approved IV choline formulation for PS patients. It has been granted Orphan Drug designation by the FDA for the prevention and/or treatment of choline deficiency in patients on long-term parenteral nutrition and has been granted Fast Track designation as a source of choline when oral or enteral nutrition is not possible, insufficient or contraindicated. The U.S. Patent and Trademark Office has issued Protara a U.S. patent claiming a choline composition and a U.S. patent claiming a method of treating choline deficiency with a choline composition, each with a term expiring in 2041. About Protara Therapeutics, Inc. Protara is a clinical-stage biotechnology company committed to advancing transformative therapies for people with cancer and rare diseases. Protara’s portfolio includes its lead candidate, TARA-002, an investigational cell-based therapy in development for the treatment of non-muscle invasive bladder cancer (NMIBC) and lymphatic malformations (LMs). The Company is evaluating TARA-002 in ongoing clinical trials in NMIBC patients with carcinoma in situ (CIS) who are unresponsive or naïve to treatment with Bacillus Calmette-Guérin, as well as a pivotal Phase 2 trial in pediatric patients with LMs. Additionally, Protara is developing IV Choline Chloride, an investigational phospholipid substrate replacement for patients on parenteral support who are otherwise unable to meet their choline needs via oral or enteral routes. For more information, visit www.protaratx.com. Forward-Looking Statements Statements contained in this press release regarding matters that are not historical facts are “forward looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. Protara may, in some cases, use terms such as “predicts,” “believes,” “potential,” “proposed,” “continue,” “designed,” “estimates,” “anticipates,” “expects,” “plans,” “intends,” “may,” “could,” “might,” “will,” “should” or other words or expressions referencing future events, conditions or circumstances that convey uncertainty of future events or outcomes to identify these forward-looking statements. Such forward-looking statements include but are not limited to, statements regarding Protara’s intentions, beliefs, projections, outlook, analyses or current expectations concerning, among other things: Protara’s business strategy, including its development plans for its product candidates and plans regarding the timing or outcome of existing or future clinical trials (including the timing of any particular phases of such trials and the timing of the announcement of any data produced during such trials or phases thereof); statements related to expectations regarding interactions with the U.S. Food and Drug Administration (FDA); Protara’s financial position; statements regarding the anticipated safety or efficacy of Protara’s product candidates; and Protara’s outlook for the remainder of the year and future periods. Because such statements are subject to risks and uncertainties, actual results may differ materially from those expressed or implied by such forward-looking statements. Factors that contribute to the uncertain nature of the forward-looking statements include: risks that Protara’s financial guidance may not be as expected, as well as risks and uncertainties associated with: Protara’s development programs, including the initiation and completion of non-clinical studies and clinical trials and the timing of required filings with the FDA and other regulatory agencies; general market conditions; changes in the competitive landscape; changes in Protara’s strategic and commercial plans; Protara’s ability to obtain sufficient financing to fund its strategic plans and commercialization efforts; having to use cash in ways or on timing other than expected; the impact of market volatility on cash reserves; failure to attract and retain management and key personnel; the impact of general U.S. and foreign, economic, industry, market, regulatory, political or public health conditions; and the risks and uncertainties associated with Protara’s business and financial condition in general, including the risks and uncertainties described more fully under the caption “Risk Factors” and elsewhere in Protara’s filings and reports with the United States Securities and Exchange Commission. All forward-looking statements contained in this press release speak only as of the date on which they were made and are based on management’s assumptions and estimates as of such date. Protara undertakes no obligation to update any forward-looking statements, whether as a result of the receipt of new information, the occurrence of future events or otherwise, except as required by law. Company Contact: Justine O'MalleyProtara [email protected]

The Company intends to submit a Biologics License Application (BLA) for TARA-002 in Lymphatic Malformations (LMs) in 2H 2027 Hosting virtual investor webinar discussing LMs program with key opinion leader (KOL) perspectives on May 19, 2026 at 4:30 pm ET Interim safety and durability data from STARBORN-1 trial of TARA-002 in LMs to be presented at the International Society for the Study of Vascular Anomalies (ISSVA) World Congress 2026 in May Company expects to complete enrollment of the BCG-Unresponsive registrational cohort of the ADVANCED-2 trial and initiate the ADVANCED-3 registrational trial in BCG-Naïve patients in 2H 2026 Presenting updated 12-month data from Phase 2 ADVANCED-2 trial of TARA-002 in patients with high-grade, BCG-Naïve non-muscle invasive bladder cancer (NMIBC) at the American Urological Association (AUA) Annual Meeting 2026 in May Cash, cash equivalents and investments of approximately $177 million as of March 31, 2026, expected to support planned operations into 2028 NEW YORK, May 13, 2026 (GLOBE NEWSWIRE) -- Protara Therapeutics, Inc. (Nasdaq: TARA), a clinical-stage biotechnology company developing transformative therapies for the treatment of cancer and rare diseases, today provided a business update and announced financial results for the first quarter ended March 31, 2026. “We’re pleased with the productive discussions we’ve had with the FDA around TARA-002 in LMs,” said Jesse Shefferman, Chief Executive Officer of Protara Therapeutics. “We intend to submit a BLA for TARA-002 in LMs based on the results of the pivotal STARBORN-1 trial in the second half of 2027. Later this month, we look forward to presenting updated safety and durability data from the STARBORN-1 trial at the ISSVA World Congress and hosting an investor webinar with KOL perspectives.” Mr. Shefferman added, “In NMIBC, we continue to establish TARA-002's potential as a differentiated treatment through a robust clinical data set demonstrating excellent safety, promising efficacy and encouraging durability, as well as a convenient and tolerable method of administration, in both Bacillus Calmette-Guérin (BCG)-Unresponsive and BCG-Naive patients. Looking ahead, we remain focused on completing enrollment in the BCG-Unresponsive registrational cohort in the ADVANCED-2 trial and initiating the ADVANCED-3 registrational trial in BCG-Naïve patients, both in the second half of the year. Additionally, our THRIVE-3 program for IV Choline Chloride remains on track, and we expect to announce interim results in the second half of 2026.” Recent Progress and Highlights TARA-002 in LMs Under Breakthrough Therapy designation, Protara is engaged in an ongoing dialogue with the FDA and has received confirmation that the review of TARA-002 has been moved from the Office of Vaccines Research and Review to the Office of Therapeutic Products, which has significant experience in pediatric rare disease and is the review division for TARA-002 in NMIBC. Based on engagement with the FDA, the Company intends to submit a BLA for TARA-002 in LMs based on the results of the pivotal STARBORN-1 trial in the second half of 2027 and will continue to submit safety and efficacy data from the trial on an ongoing basis to support the FDA’s evaluation of the risks and benefits of TARA-002 in LMs. Protara plans to host a virtual investor webinar discussing TARA-002 in LMs at 4:30 pm ET on May 19, 2026. The event will provide an overview of TARA-002 in LMs, KOL perspectives on the unmet need and TARA-002’s potential role in the treatment paradigm. The live event and accompanying slides can be accessed visiting the Events and Presentations section of the Company’s website https://ir.protaratx.com. A replay of the webcast will be archived for a limited time following the event. The Company will present updated interim safety and durability data from the ongoing Phase 2 STARBORN-1 trial evaluating TARA-002 in macrocystic and mixed cystic LMs in a poster session at the ISSVA World Congress on May 20, 2026 in Philadelphia, Pennsylvania. TARA-002 in NMIBC The Company expects to complete enrollment of the BCG-Unresponsive cohort of the ADVANCED-2 trial in the second half of 2026. The Company will present updated 12-month landmark results for TARA-002 in BCG-Naïve NMIBC patients in Cohort A of the ADVANCED-2 trial during a poster presentation at the AUA Annual Meeting on May 15, 2026 in Washington, D.C. The Company is planning a proposed registrational trial in BCG-Naïve and potentially BCG-Exposed patients. Protara continues to engage with the FDA on aspects of the analysis plan and intends to initiate the ADVANCED-3 trial in the second half of 2026. IV Choline Chloride for Patients on Parenteral Support (PS) THRIVE-3, the Company’s registrational Phase 3 clinical trial, is ongoing, and the Company expects to report interim results in the second half of 2026. First Quarter 2026 Financial Results As of March 31, 2026, unrestricted cash and cash equivalents and marketable debt securities totaled $177.4 million. The Company expects its cash and cash equivalents and marketable debt securities will be sufficient to fund its planned operations and milestones into 2028. Research and development expenses for the first quarter of 2026 increased to $13.6 million from $9.1 million for the prior year period. This increase was primarily due to a $2.2 million increase in direct expenses for our product candidates and a $2.2 million increase in indirect expenses not directly attributable to one specific product candidate. The increase in direct expenses was primarily due to higher ongoing costs associated with the ADVANCED-2 trial for NMIBC as well as start-up costs related to the ADVANCED-3 trial for NMIBC. General and administrative expenses for the first quarter of 2026 increased to $6.1 million from $5.0 million for the prior year period. The increase was primarily due to personnel-related expenses, including stock-based compensation. For the first quarter of 2026, Protara incurred a net loss of $17.8 million, or $0.31 per share, compared with a net loss of $11.9 million, or $0.29 per share, for the same period in 2025. Net loss for the first quarter of 2026 included approximately $1.4 million in stock-based compensation expenses. About TARA-002 TARA-002 is an investigational cell therapy in development for the treatment of NMIBC and of LMs, for which it has been granted Rare Pediatric Disease, Orphan Drug, Breakthrough Therapy and Fast Track designations by the FDA. TARA-002 is a first-in-class TLR2/NOD2 agonist and novel immunopotentiator derived from inactivated Streptococcus pyogenes with a mechanism of action that includes the activation of innate and adaptive immune pathways. When TARA-002 is administered, it is hypothesized that innate and adaptive immune cells within the cyst or tumor are activated and produce a pro-inflammatory response with the release of cytokines such as tumor necrosis factor (TNF)-alpha, interferon (IFN)-gamma, IL-6, IL-10 and IL-12. TARA-002 also directly kills tumor cells and triggers a host immune response by inducing immunogenic cell death, which further enhances the antitumor immune response. TARA-002 was developed from the same master cell bank of genetically distinct group A Streptococcus pyogenes as OK-432, a broad immunopotentiator marketed as Picibanil® in Japan by Chugai Pharmaceutical Co., Ltd. About Non-Muscle Invasive Bladder Cancer Bladder cancer is the sixth most common cancer in the United States, with non-muscle invasive bladder cancer (NMIBC) representing approximately 80% of bladder cancer diagnoses, or approximately 65,000 patients in the U.S. each year. NMIBC is cancer found in the tissue that lines the inner surface of the bladder that has not spread into the bladder muscle. About Lymphatic Malformations Lymphatic Malformations (LMs) are rare, congenital malformations of lymphatic vessels resulting in the failure of these structures to connect or drain into the venous system. Protara’s focus is on macrocystic and mixed cystic LMs, for which there are no currently approved therapies. They are most frequently present in the head and neck region and are diagnosed in early childhood during the period of active lymphatic growth, with more than 50% detected at birth and 90% diagnosed before the age of three years. The most common morbidities and serious manifestations of the disease include compression of the upper aerodigestive tract, including airway obstruction requiring intubation and possible tracheostomy dependence; intralesional bleeding; impingement on critical structures, including nerves, vessels and lymphatics; recurrent infection; and cosmetic and other functional disabilities. TARA-002 has been granted Rare Pediatric Disease, Orphan Drug, Breakthrough Therapy and Fast Track designations by the FDA for the treatment of LMs. About IV Choline Chloride for Patients on Parenteral Support IV Choline Chloride is an investigational, intravenous phospholipid substrate replacement therapy in development for patients receiving parenteral support (PS). Choline is a known important substrate for phospholipids that are critical for healthy liver function and play an important role in modulating gene expression, cell membrane signaling, brain development and neurotransmission, muscle function and bone health. PS patients are unable to synthesize choline from enteral nutrition sources, and there are currently no available PS formulations containing choline. Approximately 78% of patients dependent on PS are choline-deficient and of those approximately 63% have some degree of liver dysfunction, which can lead to hepatic failure. Every year in the U.S. there are approximately 90,000 people who require PS at home and of those approximately 30,000 are on long-term PS. IV Choline Chloride has the potential to become the first FDA approved IV choline formulation for PS patients. It has been granted Orphan Drug designation by the FDA for the prevention and/or treatment of choline deficiency in patients on long-term parenteral nutrition and has been granted Fast Track designation as a source of choline when oral or enteral nutrition is not possible, insufficient or contraindicated. The U.S. Patent and Trademark Office has issued Protara a U.S. patent claiming a choline composition and a U.S. patent claiming a method of treating choline deficiency with a choline composition, each with a term expiring in 2041. About Protara Therapeutics, Inc. Protara is a clinical-stage biotechnology company committed to advancing transformative therapies for people with cancer and rare diseases. Protara’s portfolio includes its lead candidate, TARA-002, an investigational cell-based therapy in development for the treatment of non-muscle invasive bladder cancer (NMIBC) and lymphatic malformations (LMs). The Company is evaluating TARA-002 in an ongoing Phase 2 trial in NMIBC patients with carcinoma in situ (CIS) who are unresponsive or naïve to treatment with Bacillus Calmette-Guérin, as well as a pivotal Phase 2 trial in pediatric patients with LMs. Additionally, Protara is developing IV Choline Chloride, an investigational phospholipid substrate replacement for patients on parenteral support who are otherwise unable to meet their choline needs via oral or enteral routes. For more information, visit www.protaratx.com. Forward-Looking Statements Statements contained in this press release regarding matters that are not historical facts are "forward looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. Protara may, in some cases, use terms such as “predicts,” “believes,” “potential,” “proposed,” “continue,” “designed,” “estimates,” “anticipates,” “expects,” “plans,” “intends,” “may,” “could,” “might,” “will,” “should” or other words or expressions referencing future events, conditions or circumstances that convey uncertainty of future events or outcomes to identify these forward-looking statements. Such forward-looking statements include but are not limited to, statements regarding Protara’s intentions, beliefs, projections, outlook, analyses or current expectations concerning, among other things: Protara’s business strategy, including its development plans for its product candidates and plans regarding the timing or outcome of existing or future clinical trials (including the timing of any particular phases of such trials and the timing of the announcement of any data produced during such trials or phases thereof); statements related to expectations regarding interactions with the U.S. Food and Drug Administration (FDA); Protara’s financial position; statements regarding the anticipated safety or efficacy of Protara’s product candidates; and Protara’s outlook for the remainder of the year and future periods. Because such statements are subject to risks and uncertainties, actual results may differ materially from those expressed or implied by such forward-looking statements. Factors that contribute to the uncertain nature of the forward-looking statements include: risks that Protara’s financial guidance may not be as expected, as well as risks and uncertainties associated with: Protara’s development programs, including the initiation and completion of non-clinical studies and clinical trials and the timing of required filings with the FDA and other regulatory agencies; general market conditions; changes in the competitive landscape; changes in Protara’s strategic and commercial plans; Protara’s ability to obtain sufficient financing to fund its strategic plans and commercialization efforts; having to use cash in ways or on timing other than expected; the impact of market volatility on cash reserves; failure to attract and retain management and key personnel; the impact of general U.S. and foreign, economic, industry, market, regulatory, political or public health conditions; and the risks and uncertainties associated with Protara’s business and financial condition in general, including the risks and uncertainties described more fully under the caption “Risk Factors” and elsewhere in Protara's filings and reports with the United States Securities and Exchange Commission. All forward-looking statements contained in this press release speak only as of the date on which they were made and are based on management's assumptions and estimates as of such date. Protara undertakes no obligation to update any forward-looking statements, whether as a result of the receipt of new information, the occurrence of future events or otherwise, except as required by law. Company Contact: Justine O'MalleyProtara [email protected]

Reported interim data from ADVANCED-2 trial in non-muscle invasive bladder cancer (NMIBC); TARA-002 demonstrated 68% complete response rate at six months in BCG-Unresponsive patients Company expects to complete enrollment of the BCG-Unresponsive registrational cohort of the ADVANCED-2 trial in 2H 2026 On track to initiate the ADVANCED-3 registrational trial in BCG-Naïve patients in 2H 2026 Received Breakthrough Therapy and Fast Track designations for TARA-002 in lymphatic malformations (LMs); regulatory update expected in 1H 2026 Expect to report interim results from THRIVE-3 registrational trial of IV Choline Chloride in patients dependent on long-term parenteral support in 2H 2026 Completed oversubscribed $86 million public offering with participation from new and existing investors Cash, cash equivalents and investments of approximately $198 million as of December 31, 2025, expected to support planned operations into 2028 NEW YORK, March 10, 2026 (GLOBE NEWSWIRE) -- Protara Therapeutics, Inc. (Nasdaq: TARA), a clinical-stage biotechnology company developing transformative therapies for the treatment of cancer and rare diseases, today provided a business update and announced financial results for the fourth quarter and full year ended December 31, 2025. “Over the last few months, we reported meaningful clinical and regulatory progress across our portfolio of late-stage programs and are building on this momentum as we advance toward several important milestones in 2026,” said Jesse Shefferman, Chief Executive Officer of Protara Therapeutics. “For TARA-002 in non-muscle invasive bladder cancer (NMIBC), the clinical dataset continues to support its potential as a differentiated intravesical therapy with compelling efficacy, a favorable safety profile and a streamlined approach to administration in the clinical setting for both Bacillus Calmette-Guérin (BCG)-Unresponsive and BCG-Naïve patients. We remain on track to complete enrollment in our BCG-Unresponsive registrational cohort in the ADVANCED-2 trial and to initiate the ADVANCED-3 registrational trial in BCG-Naïve patients in the second half of 2026.” Mr. Shefferman added, “For our rare disease programs, we reported positive interim results for TARA-002 in lymphatic malformations (LMs), followed by the receipt of Breakthrough Therapy and Fast Track designations for TARA-002 in LMs from the U.S. Food and Drug Administration (FDA). We are working with the FDA to bring this promising treatment to patients expeditiously and expect to provide a regulatory update in the first half of 2026. In addition, our THRIVE-3 registrational trial of intravenous (IV) Choline Chloride for patients on parenteral support remains on track, with interim results expected in the second half of 2026. With cash runway into 2028, we are well positioned to continue executing across our pipeline and advance our mission of delivering transformational therapies for patients with cancer and rare diseases.” Recent Progress and Highlights TARA-002 in NMIBC At the ASCO Genitourinary Cancers Symposium in February 2026, the Company announced updated interim results from the ADVANCED-2 trial in evaluable NMIBC patients with carcinoma in situ or CIS (± Ta/T1) who are BCG-Unresponsive and BCG-Naïve. As of the January 28, 2026 data cutoff: In the BCG-Unresponsive cohort of patients, TARA-002 demonstrated a complete response (CR) rate at any time of 65.7% (23/35) with CR rates of 68.2% (15/22) at six months and 33.3% (5/12) at 12 months. Among responders, the Kaplan-Meier (KM) estimated probability of maintaining a CR for six months was 71.1% (95% CI: 46.7, 95.5). Additionally, among responders, 100% (5 of 5) maintained their CR from nine to 12 months. Re-induction therapy was successful with 61.5% (8 of 13) of re-induced patients converting to a CR at six months. In the BCG-Naïve cohort of patients, TARA-002 demonstrated a CR rate at any time of 72.4% (21/29) with CR rates of 66.7% (18 of 27) at six months and 57.9% (11 of 19) at 12 months. Among responders, the KM estimated probability of maintaining a CR for six months was 73.1% (95% CI: 52.9, 93.4). In addition, among responders, 100% (11 of 11) maintained their CR from nine to 12 months. Re-induction therapy was successful with 66.7% (4 of 6) of re-induced patients converting to a CR at six months. The majority of treatment-related adverse events (TRAEs) were Grade 1 and transient with no Grade 3 or greater TRAEs and no related serious adverse events as assessed by study investigators. No patients discontinued treatment due to TRAEs. The most common TRAEs were dysuria, bladder spasm, fatigue and micturition urgency. Most bladder irritations resolved shortly after administration or within a few hours to a few days. The Company has completed enrollment of the BCG-Naïve cohort and expects to complete enrollment of the BCG-Unresponsive cohort in the second half of 2026. The Company remains on track to commence ADVANCED-3, a registrational trial of TARA-002 compared to intravesical chemotherapy in BCG-Naïve patients (who have never been exposed and those who have not received BCG within the last 24 months and are ineligible to receive BCG, have a contraindication to BCG, cannot tolerate BCG, do not have access to BCG or refuse BCG) in the second half of 2026. TARA-002 in LMs In January 2026, the Company announced that the FDA granted TARA-002 Fast Track and Breakthrough Therapy designations for the treatment of pediatric patients with macrocystic and mixed cystic LMs. TARA-002 was previously granted Rare Pediatric Disease designation for the treatment of LMs. The Company remains on track to share a regulatory update on the registrational path for TARA-002 in LMs in the first half of 2026. IV Choline Chloride for Patients on Parenteral Support (PS) THRIVE-3, the Company’s registrational Phase 3 clinical trial, is ongoing, and the Company expects to report interim results in the second half of 2026. Corporate Update Fourth Quarter and Full Year 2025 Financial Results As of December 31, 2025, unrestricted cash and cash equivalents and marketable debt securities totaled $197.9 million, including proceeds from the Company’s $86.3 million public offering in December 2025. The Company expects its cash and cash equivalents and marketable debt securities will be sufficient to fund its planned operations and milestones into 2028. Research and development expenses for the fourth quarter of 2025 increased to $13.1 million from $9.5 million for the prior year period, and for the full year increased to $42.6 million compared to $31.7 million for 2024. The fourth quarter and full year increases were primarily due to the start-up and advancement of clinical trials across our portfolio. General and administrative expenses for the fourth quarter of 2025 increased to $6.0 million from $4.8 million for the prior year period, and for the full year increased to $21.9 million compared to $17.5 million for 2024. The fourth quarter and full year increases were primarily due to increases in personnel-related expenses and other general and administrative expenses primarily related to professional and consulting services. For the fourth quarter of 2025, Protara incurred a net loss of $17.3 million, or $0.37 per share, compared with a net loss of $12.8 million, or $0.48 per share, for the same period in 2024. Net loss for the year ended December 31, 2025 was $57.4 million, or $1.34 per share, compared with a net loss of $44.6 million, or $2.17 per share, for the year ended December 31, 2024. Net loss for the fourth quarter of 2025 included approximately $1.0 million in stock-based compensation expenses. Net loss for the year ended December 31, 2025 included approximately $3.8 million in stock-based compensation expenses. About ADVANCED-2 ADVANCED-2 (NCT05951179) is a Phase 2 open-label trial assessing intravesical TARA-002 in non-muscle invasive bladder cancer (NMIBC) patients with carcinoma in situ or CIS (± Ta/T1) who are Bacillus Calmette-Guérin (BCG)-Unresponsive (Cohort B N=75-100) or BCG-Naïve (Cohort A N=31). Trial subjects received an induction course, with or without a reinduction, of six weekly intravesical instillations of TARA-002, followed by a maintenance course of three weekly instillations every three months. The BCG-Unresponsive cohort is designed to be registrational based on the FDA’s August 2024 Draft Guidance for Industry on BCG-Unresponsive Nonmuscle Invasive Bladder Cancer: Developing Drugs and Biological Products for Treatment. About TARA-002 TARA-002 is an investigational cell therapy in development for the treatment of NMIBC and of LMs, for which it has been granted Rare Pediatric Disease, Breakthrough and Fast Track designations by the FDA. TARA-002 is a first-in-class TLR2/NOD2 agonist and novel immunopotentiator derived from inactivated Streptococcus pyogenes with a mechanism of action that includes the activation of innate and adaptive immune pathways within the bladder wall. When TARA-002 is administered, it is hypothesized that innate and adaptive immune cells within the cyst or tumor are activated and produce a pro-inflammatory response with the release of cytokines such as tumor necrosis factor (TNF)-alpha, interferon (IFN)-gamma, IL-6, IL-10 and IL-12. TARA-002 also directly kills tumor cells and triggers a host immune response by inducing immunogenic cell death, which further enhances the antitumor immune response. TARA-002 was developed from the same master cell bank of genetically distinct group A Streptococcus pyogenes as OK-432, a broad immunopotentiator marketed as Picibanil® in Japan by Chugai Pharmaceutical Co., Ltd. Protara has successfully shown manufacturing comparability between TARA-002 and OK-432. About Non-Muscle Invasive Bladder Cancer Bladder cancer is the sixth most common cancer in the United States, with non-muscle invasive bladder cancer (NMIBC) representing approximately 80% of bladder cancer diagnoses, or approximately 65,000 patients in the U.S. each year. NMIBC is cancer found in the tissue that lines the inner surface of the bladder that has not spread into the bladder muscle. About Lymphatic Malformations Lymphatic Malformations (LMs) are rare, congenital malformations of lymphatic vessels resulting in the failure of these structures to connect or drain into the venous system. Protara’s focus is on macrocystic and mixed cystic LMs, for which there are no currently approved therapies. They are most frequently present in the head and neck region and are diagnosed in early childhood during the period of active lymphatic growth, with more than 50% detected at birth and 90% diagnosed before the age of three years. The most common morbidities and serious manifestations of the disease include compression of the upper aerodigestive tract, including airway obstruction requiring intubation and possible tracheostomy dependence; intralesional bleeding; impingement on critical structures, including nerves, vessels and lymphatics; recurrent infection; and cosmetic and other functional disabilities. TARA-002 has been granted Rare Pediatric Disease, Breakthrough Therapy and Fast Track designations by the FDA for the treatment of LMs. About IV Choline Chloride for Patients on Parenteral Support IV Choline Chloride is an investigational, intravenous phospholipid substrate replacement therapy in development for patients receiving parenteral support (PS). Choline is a known important substrate for phospholipids that are critical for healthy liver function and play an important role in modulating gene expression, cell membrane signaling, brain development and neurotransmission, muscle function and bone health. PS patients are unable to synthesize choline from enteral nutrition sources, and there are currently no available PS formulations containing choline. Approximately 78% of patients dependent on PS are choline-deficient and of those approximately 63% have some degree of liver dysfunction, which can lead to hepatic failure. Every year in the U.S. there are approximately 90,000 people who require PS at home and of those approximately 30,000 are on long-term PS. IV Choline Chloride has the potential to become the first FDA approved IV choline formulation for PS patients. It has been granted Orphan Drug designation by the FDA for the prevention and/or treatment of choline deficiency in patients on long-term parenteral nutrition and has been granted Fast Track designation as a source of choline when oral or enteral nutrition is not possible, insufficient or contraindicated. The U.S. Patent and Trademark Office has issued Protara a U.S. patent claiming a choline composition and a U.S. patent claiming a method for treating choline deficiency with a choline composition, each with a term expiring in 2041. About Protara Therapeutics, Inc. Protara is a clinical-stage biotechnology company committed to advancing transformative therapies for people with cancer and rare diseases. Protara’s portfolio includes its lead candidate, TARA-002, an investigational cell-based therapy in development for the treatment of non-muscle invasive bladder cancer (NMIBC) and lymphatic malformations (LMs). The Company is evaluating TARA-002 in an ongoing Phase 2 trial in NMIBC patients with carcinoma in situ (CIS) who are unresponsive or naïve to treatment with Bacillus Calmette-Guérin, as well as a Phase 2 trial in pediatric patients with LMs. Additionally, Protara is developing IV Choline Chloride, an investigational phospholipid substrate replacement for patients on parenteral support who are otherwise unable to meet their choline needs via oral or enteral routes. For more information, visit www.protaratx.com. Forward-Looking Statements Statements contained in this press release regarding matters that are not historical facts are "forward looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. Protara may, in some cases, use terms such as “predicts,” “believes,” “potential,” “proposed,” “continue,” “designed,” “estimates,” “anticipates,” “expects,” “plans,” “intends,” “may,” “could,” “might,” “will,” “should” or other words or expressions referencing future events, conditions or circumstances that convey uncertainty of future events or outcomes to identify these forward-looking statements. Such forward-looking statements include but are not limited to, statements regarding Protara’s intentions, beliefs, projections, outlook, analyses or current expectations concerning, among other things: Protara’s business strategy, including its development plans for its product candidates and plans regarding the timing or outcome of existing or future clinical trials (including the timing of any particular phases of such trials and the timing of the announcement of any data produced during such trials or phases thereof); statements related to expectations regarding interactions with the U.S. Food and Drug Administration (FDA); Protara’s financial position; statements regarding the anticipated safety or efficacy of Protara’s product candidates; and Protara’s outlook for the remainder of the year and future periods. Because such statements are subject to risks and uncertainties, actual results may differ materially from those expressed or implied by such forward-looking statements. Factors that contribute to the uncertain nature of the forward-looking statements include: risks that Protara’s financial guidance may not be as expected, as well as risks and uncertainties associated with: Protara’s development programs, including the initiation and completion of non-clinical studies and clinical trials and the timing of required filings with the FDA and other regulatory agencies; general market conditions; changes in the competitive landscape; changes in Protara’s strategic and commercial plans; Protara’s ability to obtain sufficient financing to fund its strategic plans and commercialization efforts; having to use cash in ways or on timing other than expected; the impact of market volatility on cash reserves; failure to attract and retain management and key personnel; the impact of general U.S. and foreign, economic, industry, market, regulatory, political or public health conditions; and the risks and uncertainties associated with Protara’s business and financial condition in general, including the risks and uncertainties described more fully under the caption “Risk Factors” and elsewhere in Protara's filings and reports with the United States Securities and Exchange Commission. All forward-looking statements contained in this press release speak only as of the date on which they were made and are based on management's assumptions and estimates as of such date. Protara undertakes no obligation to update any forward-looking statements, whether as a result of the receipt of new information, the occurrence of future events or otherwise, except as required by law. Company Contact: Justine O'Malley Protara Therapeutics [email protected] 646-817-2836

80% of patients that completed treatment and 100% of patients that completed the eight-week response assessment achieved clinical success Clinical success achieved with one or two doses of TARA-002 in 88% of patients TARA-002 demonstrated favorable safety and tolerability profile with no serious adverse events reported Company to host conference call and webcast featuring Key Opinion Leader Dr. Jesse Jones at 8:30 a.m. ET NEW YORK, Nov. 19, 2025 (GLOBE NEWSWIRE) -- Protara Therapeutics, Inc. (Nasdaq: TARA), a clinical-stage company developing transformative therapies for the treatment of cancer and rare diseases, today announced positive interim results from its ongoing Phase 2 open-label STARBORN-1 trial assessing intracystic injection of TARA-002, the Company’s investigational cell-based therapy, in pediatric patients with macrocystic and mixed cystic lymphatic malformations (LMs). “We are pleased to report these robust results from the STARBORN-1 trial that demonstrate TARA-002’s expected significant clinical benefit in treating patients with macrocystic and mixed cystic LMs,” said Jesse Shefferman, Chief Executive Officer of Protara Therapeutics. “Treatment with TARA-002 resulted in clinically meaningful responses, with a favorable safety profile observed across all evaluable patients. The totality of available clinical data, including data from prior studies with TARA-002’s predecessor compound OK-432, an established treatment for LMs in Japan, underscore our belief in the potential for TARA-002 to emerge as an important intervention for pediatric patients suffering from LMs.” “There are currently no approved therapies for LMs, with many patients turning to invasive surgical procedures that carry high rates of complication and recurrence, or off-label use of chemotherapies and chemicals, which can have challenging side effects, especially for pediatric patients,” said Jesse G.A. Jones, M.D., Associate Professor, Department of Neurosurgery and Radiology, University of Alabama at Birmingham, and STARBORN-1 study investigator. “I am encouraged by the positive interim safety and efficacy data from TARA-002 and believe this promising candidate has the potential to help the many patients in need of FDA-approved therapeutic approaches for LMs.” STARBORN-1 Interim Results The interim analysis includes a total of 12 patients who enrolled in the trial and received ≥ 1 dose of TARA-002 as of the November 12, 2025 data cutoff. Of those, eight patients were evaluable at an eight-week post-treatment assessment, two withdrew prior to the eight-week assessment and two remain in dosing. Patients receive up to four injections of TARA-002 spaced approximately six weeks apart. Of the eight patients who were evaluable, the majority (7/8) achieved clinical success with one or two doses. Only one patient, who presented with a 1,739 ml macrocystic LM, required all four doses, and achieved a complete response. 80% (8/10) of patients that completed treatment achieved clinical success 100% (8/8) of patients who completed the eight-week response assessment achieved clinical success 83% (5/6) of macrocystic patients achieved a complete response (90% to 100% reduction in total LM volume) and one patient achieved a substantial response (60% to less than 90% reduction in total LM volume) The only mixed cystic patient treated achieved a complete response Two LMs patients reached the 32-week post-treatment assessment and remain disease-free One patient deemed a complete response was subsequently diagnosed with a ranula (a different type of maxillofacial cyst from LMs) Two patients withdrew before the eight-week post-treatment assessment: One patient was misdiagnosed and had a rare form of cancer and did not respond to treatment One patient dropped out after achieving a notable resolution of the patient’s macrocystic LM. The patient received two doses of TARA-002 with 160 ml aspiration at the first dose, which was reduced to a 10 ml aspiration at second dose. Safety The majority of adverse events (AEs) were mild to moderate, with no serious AEs reported. The most common AEs were swelling and fatigue. One patient discontinued treatment due to a Grade 2 AE of fatigue. About STARBORN-1 STARBORN-1 is a Phase 2 single-arm, open-label, prospective clinical trial evaluating the safety and efficacy of intracystic injection of TARA-002 for the treatment of macrocystic and mixed cystic LMs (≥ 50% macrocystic disease) in 29 participants six months to less than 18 years of age. The trial includes age de-escalation safety lead-in cohorts of children ages six years to less than 18 years, two years to less than six years and six months to less than two years. Assessment of efficacy is based on the proportion of participants with macrocystic and mixed cystic LMs who demonstrate clinical success, defined as having either a complete response (90% to 100% reduction from baseline in total LM volume) or substantial response (60% to less than 90% reduction in total LM volume) as measured by axial imaging or via investigator assessment (physical exam, visual inspection and ultrasound). More information about the trial is available at clinicaltrials.gov (identifier: NCT05871970). Conference Call and Webcast Protara will host a conference call and webcast today at 8:30 am ET to review the data reported this morning, as well as provide an overview of LMs, the current treatment landscape and the TARA-002 program in LMs. Members of the management team will be joined by STARBORN-1 study investigator Jesse G.A. Jones, M.D., Associate Professor, Department of Neurosurgery and Radiology, University of Alabama at Birmingham. The live event and accompanying slides can be accessed by visiting https://protara-therapeutics-update-call.open-exchange.net/registration, or via the Events and Presentations section of the Company’s website: https://ir.protaratx.com. A replay of the webcast will be archived for a limited time following the event. About TARA-002 in LMs TARA-002 is an investigational, genetically distinct strain of streptococcus pyogenes that is inactivated while retaining its immune-stimulating properties. It was developed from the same master cell bank as OK-432, which was originally granted marketing approval by the Japanese Ministry of Health for the treatment of LMs and has been the standard of care in Japan for 30 years. In addition, OK-432 was studied in a large Phase 2 trial in LMs in over 500 patients with significant clinical success. TARA-002 has been granted Rare Pediatric Disease designation by the U.S. Food and Drug Administration for the treatment of LMs. About Lymphatic Malformations Lymphatic malformations (LMs) are rare, congenital malformations of lymphatic vessels resulting in the failure of these structures to connect or drain into the venous system. Most LMs are present in the head and neck region and are diagnosed in early childhood during the period of active lymphatic growth, with more than 50% detected at birth and 90% diagnosed before the age of three years. The most common morbidities and serious manifestations of the disease include compression of the upper aerodigestive tract, including airway obstruction requiring intubation and possible tracheostomy dependence; intralesional bleeding; impingement on critical structures, including nerves, vessels and lymphatics; recurrent infection; and cosmetic and other functional disabilities. About Protara Therapeutics, Inc. Protara is a clinical-stage biotechnology company committed to advancing transformative therapies for people with cancer and rare diseases. Protara’s portfolio includes its lead candidate, TARA-002, an investigational cell-based therapy in development for the treatment of non-muscle invasive bladder cancer (NMIBC) and lymphatic malformations (LMs). The Company is evaluating TARA-002 in an ongoing Phase 2 trial in NMIBC patients with carcinoma in situ who are unresponsive or naïve to treatment with Bacillus Calmette-Guérin, as well as a Phase 2 trial in pediatric patients with LMs. Additionally, Protara is developing IV Choline Chloride, an investigational phospholipid substrate replacement for patients on parenteral nutrition who are otherwise unable to meet their choline needs via oral or enteral routes. For more information, visit www.protaratx.com. Forward-Looking Statements Statements contained in this press release regarding matters that are not historical facts are "forward looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. Protara may, in some cases, use terms such as “predicts,” “believes,” “potential,” “proposed,” “continue,” “designed,” “estimates,” “anticipates,” “expects,” “plans,” “intends,” “may,” “could,” “might,” “will,” “should” or other words or expressions referencing future events, conditions or circumstances that convey uncertainty of future events or outcomes to identify these forward-looking statements. Such forward-looking statements include but are not limited to, statements regarding Protara’s intentions, beliefs, projections, outlook, analyses or current expectations concerning, among other things: Protara’s business strategy, including its development plans for its product candidates and plans regarding the timing or outcome of existing or future clinical trials (including the timing of any particular phases of such trials and the timing of the announcement of any data produced during such trials or phases thereof); statements related to expectations regarding interactions with the U.S. Food and Drug Administration (FDA); Protara’s financial position; statements regarding the anticipated safety or efficacy of Protara’s product candidates; and Protara’s outlook for the remainder of the year and future periods. Because such statements are subject to risks and uncertainties, actual results may differ materially from those expressed or implied by such forward-looking statements. Factors that contribute to the uncertain nature of the forward-looking statements include: risks that Protara’s financial guidance may not be as expected, as well as risks and uncertainties associated with: Protara’s development programs, including the initiation and completion of non-clinical studies and clinical trials and the timing of required filings with the FDA and other regulatory agencies; general market conditions; changes in the competitive landscape; changes in Protara’s strategic and commercial plans; Protara’s ability to obtain sufficient financing to fund its strategic plans and commercialization efforts; having to use cash in ways or on timing other than expected; the impact of market volatility on cash reserves; failure to attract and retain management and key personnel; the impact of general U.S. and foreign, economic, industry, market, regulatory, political or public health conditions; and the risks and uncertainties associated with Protara’s business and financial condition in general, including the risks and uncertainties described more fully under the caption “Risk Factors” and elsewhere in Protara's filings and reports with the United States Securities and Exchange Commission. All forward-looking statements contained in this press release speak only as of the date on which they were made and are based on management's assumptions and estimates as of such date. Protara undertakes no obligation to update any forward-looking statements, whether as a result of the receipt of new information, the occurrence of future events or otherwise, except as required by law. Company Contact: Justine O'Malley Protara Therapeutics [email protected] 646-817-2836

Results from an interim analysis in the Phase 2 STARBORN-1 trial of TARA-002 in pediatric LMs patients remain on track for 4Q 2025 Expect to present interim analysis from approximately 25 six-month evaluable BCG-Unresponsive NMIBC patients in the ongoing ADVANCED-2 trial in 1Q 2026 Dosing of first patient in THRIVE-3 registrational trial of IV Choline Chloride in patients dependent on parenteral support now expected by year-end 2025 Cash, cash equivalents and investments of approximately $134 million as of September 30, 2025, expected to support planned operations into mid-2027 NEW YORK, Nov. 10, 2025 (GLOBE NEWSWIRE) -- Protara Therapeutics, Inc. (Nasdaq: TARA) (“Protara” or the “Company”), a clinical-stage company developing transformative therapies for the treatment of cancer and rare diseases, today announced financial results for the third quarter ended September 30, 2025, and provided a business update. “We have made important advancements across our clinical programs this year, and with many significant milestones in the near future, we remain focused on disciplined execution across our pipeline of transformative therapies for patients with cancer and rare diseases,” said Jesse Shefferman, Chief Executive Officer of Protara Therapeutics. “We continue to make progress in our ADVANCED-2 trial of TARA-002 in non-muscle invasive bladder cancer (NMIBC) and remain on track to report interim results from approximately 25 BCG-Unresponsive patients in the first quarter of 2026. With a favorable safety profile and its differentiated ease of administration, we believe TARA-002 has the potential to become a meaningful addition to the evolving NMIBC treatment landscape.” Mr. Shefferman added, “Across our rare disease pipeline, we expect to provide an interim update from our STARBORN-1 trial in pediatric patients with lymphatic malformations (LMs) and dose the first patient in our registrational THRIVE-3 trial of IV Choline Chloride in the fourth quarter of 2025.” Recent Progress and Highlights TARA-002 in NMIBC The Company anticipates reporting interim results from approximately 25 six-month evaluable NMIBC patients with carcinoma in situ or CIS (± Ta/T1) who are BCG-Unresponsive in the first quarter of 2026. The Company expects to provide an update on ongoing discussions with the U.S. Food and Drug Administration (FDA) related to the BCG-Naïve opportunity in the fourth quarter of 2025. Protara continues to evaluate subcutaneous dosing through priming and maintenance combined with intravesical dosing, as well as exploring combination treatments with TARA-002 in NMIBC patients with CIS. IV Choline Chloride for Patients on Parenteral Support (PS) The Company now expects to initiate dosing in THRIVE-3, a registrational Phase 3 clinical trial, by the end of 2025 due to administrative and funding challenges in academic sites in the U.S. THRIVE-3 is a seamless Phase 2b/3 trial with a dose confirmation portion (n=24) followed by a double-blinded, randomized, placebo-controlled portion to assess the efficacy and safety of intravenous (IV) Choline Chloride over 24 weeks in adolescents and adults on long-term parenteral support (PS) when oral or enteral nutrition is not possible, insufficient, or contraindicated (n=105). IV Choline Chloride was previously granted Fast Track designation by the FDA. TARA-002 in LMs Protara continues to advance the Phase 2 STARBORN-1 trial of TARA-002 in pediatric patients with macrocystic and mixed cystic LMs, and the Company expects to provide an interim update from the trial in the fourth quarter of 2025. The Company previously announced the completion of the study’s first safety cohort, in which TARA-002 showed promising results and was generally well-tolerated. Corporate Update In November 2025, Protara was recognized among BioSpace’s Best Places to Work, which highlights organizations that excel in culture, career growth, leadership, and innovation. Third Quarter 2025 Financial Results As of September 30, 2025, unrestricted cash and cash equivalents and investments in marketable debt securities totaled $133.6 million. The Company expects its cash, cash equivalents, and investments in marketable debt securities will be sufficient to fund operations into mid-2027. Research and development expenses for the third quarter of 2025 increased to $9.6 million from $8.1 million for the prior year period. The increase was primarily due to a $0.9 million increase in startup costs for our IV Choline Chloride THRIVE-3 clinical trial. General and administrative expenses for the third quarter of 2025 increased to $5.2 million from $4.3 million for the prior year period. This increase was primarily due to an increase of $0.7 million in personnel-related expenses. For the third quarter of 2025, Protara incurred a net loss of $13.3 million, or $0.31 per share, compared with a net loss of $11.2 million, or $0.50 per share, for the same period in 2024. About TARA-002 TARA-002 is an investigational cell therapy in development for the treatment of NMIBC and of LMs, for which it has been granted Rare Pediatric Disease Designation by the U.S. Food and Drug Administration. TARA-002 was developed from the same master cell bank of genetically distinct group A Streptococcus pyogenes as OK-432, a broad immunopotentiator marketed as Picibanil® in Japan by Chugai Pharmaceutical Co., Ltd. Protara has successfully shown manufacturing comparability between TARA-002 and OK-432. When TARA-002 is administered, it is hypothesized that innate and adaptive immune cells within the cyst or tumor are activated and produce a pro-inflammatory response with release of cytokines such as tumor necrosis factor (TNF)-alpha, interferon (IFN)-gamma IL-6, IL-10, IL-12. TARA-002 also directly kills tumor cells and triggers a host immune response by inducing immunogenic cell death, which further enhances the antitumor immune response. About Non-Muscle Invasive Bladder Cancer (NMIBC) Bladder cancer is the 6th most common cancer in the United States, with NMIBC representing approximately 80% of bladder cancer diagnoses. Approximately 65,000 patients are diagnosed with NMIBC in the United States each year. NMIBC is cancer found in the tissue that lines the inner surface of the bladder that has not spread into the bladder muscle. About Lymphatic Malformations (LMs) LMs are rare, congenital malformations of lymphatic vessels resulting in the failure of these structures to connect or drain into the venous system. Most LMs are present in the head and neck region and are diagnosed in early childhood during the period of active lymphatic growth, with more than 50% detected at birth and 90% diagnosed before the age of three years. The most common morbidities and serious manifestations of the disease include compression of the upper aerodigestive tract, including airway obstruction requiring intubation and possible tracheostomy dependence; intralesional bleeding; impingement on critical structures, including nerves, vessels, lymphatics; recurrent infection, and cosmetic and other functional disabilities. About IV Choline Chloride IV Choline Chloride is an investigational, intravenous phospholipid substrate replacement therapy in development for patients receiving parenteral support (PS). Choline is a known important substrate for phospholipids that are critical for healthy liver function that also play an important role in modulating gene expression, cell membrane signaling, brain development and neurotransmission, muscle function, and bone health. PS patients are unable to synthesize choline from enteral nutrition sources, and there are currently no available PS formulations containing choline. Approximately 78% of patients dependent on PS are choline-deficient and of those approximately 63% have some degree of liver dysfunction, which can lead to hepatic failure. Every year in the U.S. there are approximately 90,000 people who require PS at home and of those approximately 30,000 are on long-term PS. IV Choline Chloride has the potential to become the first U.S. Food and Drug Administration (FDA) approved IV choline formulation for PS patients. It has been granted Orphan Drug Designation by the FDA for the prevention and/or treatment of choline deficiency in patients on long-term PN and has been granted Fast Track Designation as a source of choline when oral or enteral nutrition is not possible, insufficient, or contraindicated. The U.S. Patent and Trademark Office has issued Protara a U.S. patent claiming a choline composition and a U.S. patent claiming a method for treating choline deficiency with a choline composition, each with a term expiring in 2041. About Protara Therapeutics, Inc. Protara is a clinical-stage biotechnology company committed to advancing transformative therapies for people with cancer and rare diseases. Protara’s portfolio includes its lead candidate, TARA-002, an investigational cell-based therapy in development for the treatment of non-muscle invasive bladder cancer (NMIBC) and lymphatic malformations (LMs). The Company is evaluating TARA-002 in an ongoing Phase 2 trial in NMIBC patients with carcinoma in situ (CIS) who are unresponsive or naïve to treatment with Bacillus Calmette-Guérin (BCG), as well as a Phase 2 trial in pediatric patients with LMs. Additionally, Protara is developing IV Choline Chloride, an investigational phospholipid substrate replacement for patients on parenteral nutrition who are otherwise unable to meet their choline needs via oral or enteral routes. For more information, visit www.protaratx.com. Forward-Looking Statements Statements contained in this press release regarding matters that are not historical facts are "forward looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. Protara may, in some cases, use terms such as “predicts,” “believes,” “potential,” “proposed,” “continue,” “designed,” “estimates,” “anticipates,” “expects,” “plans,” “intends,” “may,” “could,” “might,” “will,” “should” or other words or expressions referencing future events, conditions or circumstances that convey uncertainty of future events or outcomes to identify these forward-looking statements. Such forward-looking statements include but are not limited to, statements regarding Protara’s intentions, beliefs, projections, outlook, analyses or current expectations concerning, among other things: Protara’s business strategy, including its development plans for its product candidates and plans regarding the timing or outcome of existing or future clinical trials (including the timing of any particular phases of such trials and the timing of the announcement of any data produced during such trials or phases thereof); statements related to expectations regarding interactions with the U.S. Food and Drug Administration (FDA); Protara’s financial position; statements regarding the anticipated safety or efficacy of Protara’s product candidates; and Protara’s outlook for the remainder of the year and future periods. Because such statements are subject to risks and uncertainties, actual results may differ materially from those expressed or implied by such forward-looking statements. Factors that contribute to the uncertain nature of the forward-looking statements include: risks that Protara’s financial guidance may not be as expected, as well as risks and uncertainties associated with: Protara’s development programs, including the initiation and completion of non-clinical studies and clinical trials and the timing of required filings with the FDA and other regulatory agencies; general market conditions; changes in the competitive landscape; changes in Protara’s strategic and commercial plans; Protara’s ability to obtain sufficient financing to fund its strategic plans and commercialization efforts; having to use cash in ways or on timing other than expected; the impact of market volatility on cash reserves; failure to attract and retain management and key personnel; the impact of general U.S. and foreign, economic, industry, market, regulatory, political or public health conditions; and the risks and uncertainties associated with Protara’s business and financial condition in general, including the risks and uncertainties described more fully under the caption “Risk Factors” and elsewhere in Protara's filings and reports with the United States Securities and Exchange Commission. All forward-looking statements contained in this press release speak only as of the date on which they were made and are based on management's assumptions and estimates as of such date. Protara undertakes no obligation to update any forward-looking statements, whether as a result of the receipt of new information, the occurrence of future events or otherwise, except as required by law. Company Contact: Justine O'Malley Protara Therapeutics [email protected] 646-817-2836

Presentation of interim analysis from approximately 25 six-month evaluable BCG-Unresponsive patients in the ongoing ADVANCED-2 trial expected at a medical conference in 1Q 2026 Dosing of first patient in THRIVE-3 registrational trial of IV Choline Chloride in patients dependent on parenteral support on track for 3Q 2025 On track to provide an interim update from the Phase 2 STARBORN-1 trial of TARA-002 in pediatric LMs patients in 4Q 2025 Cash, cash equivalents and investments of approximately $146 million as of June 30, 2025, expected to support planned operations into mid-2027 NEW YORK, Aug. 11, 2025 (GLOBE NEWSWIRE) -- Protara Therapeutics, Inc. (Nasdaq: TARA), a clinical-stage company developing transformative therapies for the treatment of cancer and rare diseases, today announced financial results for the second quarter ended June 30, 2025, and provided a business update. “As we look toward the second half of the year, we believe we are well positioned to continue to advance our pipeline of potentially transformative therapies for the treatment of patients with cancer and rare diseases,” said Jesse Shefferman, Chief Executive Officer of Protara Therapeutics. “We continue to execute on our ADVANCED-2 trial of TARA-002 in non-muscle invasive bladder cancer (NMIBC) and look forward to presenting interim results in the first quarter of 2026. In addition, we remain on track to dose the first patient in our THRIVE-3 registrational trial of IV Choline Chloride in patients dependent on parenteral support (PS) by the end of this quarter and expect to provide an interim update from the STARBORN-1 trial in pediatric patients with lymphatic malformations (LMs) in the fourth quarter of this year.” Recent Progress and Highlights TARA-002 in NMIBC The Company expects to report interim results from approximately 25 six-month evaluable NMIBC patients with carcinoma in situ or CIS (± Ta/T1) who are BCG-Unresponsive at a medical conference in the first quarter of 2026. Following discussions with the U.S. Food and Drug Administration (FDA), the Company expects to provide an update on next steps in its BCG-Naïve program in the second half of 2025. Protara continues to investigate subcutaneous dosing through priming and maintenance combined with intravesical dosing, as well as exploring combination treatments with TARA-002 in NMIBC patients with CIS. IV Choline Chloride for Patients on Parenteral Support (PS) The Company remains on track to dose the first patient in THRIVE-3, a registrational Phase 3 clinical trial, in the third quarter of 2025. In addition, following the recent clinical trial approval by the European Union Clinical Trials Regulation, the Company expects to begin enrollment across the EU in the coming months. THRIVE-3 is a seamless Phase 2b/3 trial with a dose confirmation portion (n=24) followed by a double-blinded, randomized, placebo-controlled portion to assess the efficacy and safety of intravenous (IV) Choline Chloride over 24 weeks in adolescents and adults on long-term PS when oral or enteral nutrition is not possible, insufficient, or contraindicated (n=105). IV Choline Chloride was previously granted Fast Track designation by the FDA. TARA-002 in LMs Dosing remains ongoing in the Phase 2 STARBORN-1 trial of TARA-002 in pediatric patients with macrocystic and mixed cystic LMs and the Company intends to provide an interim update from the trial in the fourth quarter of 2025. The Company previously announced the completion of the study’s first safety cohort, in which TARA-002 showed promising results and was generally well-tolerated. Corporate Update In June 2025, Protara announced the appointment of William “Bill” Conkling as Chief Commercial Officer. He brings to Protara more than two decades of experience developing and commercializing novel cancer and rare disease therapeutics. In June 2025, the Company announced it has been added as a member of the broad-market Russell 3000® Index as part of the annual reconstitution, effective at the open of U.S. equity markets on June 30, 2025. Second Quarter 2025 Financial Results As of June 30, 2025, unrestricted cash and cash equivalents and investments in marketable debt securities totaled $145.6 million. The Company expects its cash, cash equivalents, and investments in marketable debt securities will be sufficient to fund operations into mid-2027. Research and development expenses for the second quarter of 2025 increased to $10.8 million from $6.4 million for the prior year period. The increase was primarily due to a $3.9 million increase in clinical trial activities for TARA-002 and IV Choline Chloride. General and administrative expenses for the second quarter of 2025 increased to $5.8 million from $4.3 million for the prior year period. This increase was primarily due to an increase of $0.6 million in personnel-related expenses and $0.5 million in market development-related expenses. For the second quarter of 2025, Protara incurred a net loss of $15.0 million, or $0.35 per share, compared with a net loss of $9.5 million, or $0.45 per share, for the same period in 2024. About TARA-002 TARA-002 is an investigational cell therapy in development for the treatment of NMIBC and of LMs, for which it has been granted Rare Pediatric Disease Designation by the U.S. Food and Drug Administration. TARA-002 was developed from the same master cell bank of genetically distinct group A Streptococcus pyogenes as OK-432, a broad immunopotentiator marketed as Picibanil® in Japan by Chugai Pharmaceutical Co., Ltd. Protara has successfully shown manufacturing comparability between TARA-002 and OK-432. When TARA-002 is administered, it is hypothesized that innate and adaptive immune cells within the cyst or tumor are activated and produce a pro-inflammatory response with release of cytokines such as tumor necrosis factor (TNF)-alpha, interferon (IFN)-gamma IL-6, IL-10, IL-12. TARA-002 also directly kills tumor cells and triggers a host immune response by inducing immunogenic cell death, which further enhances the antitumor immune response. About Non-Muscle Invasive Bladder Cancer (NMIBC) Bladder cancer is the 6th most common cancer in the United States, with NMIBC representing approximately 80% of bladder cancer diagnoses. Approximately 65,000 patients are diagnosed with NMIBC in the United States each year. NMIBC is cancer found in the tissue that lines the inner surface of the bladder that has not spread into the bladder muscle. About Lymphatic Malformations (LMs) LMs are rare, congenital malformations of lymphatic vessels resulting in the failure of these structures to connect or drain into the venous system. Most LMs are present in the head and neck region and are diagnosed in early childhood during the period of active lymphatic growth, with more than 50% detected at birth and 90% diagnosed before the age of three years. The most common morbidities and serious manifestations of the disease include compression of the upper aerodigestive tract, including airway obstruction requiring intubation and possible tracheostomy dependence; intralesional bleeding; impingement on critical structures, including nerves, vessels, lymphatics; recurrent infection, and cosmetic and other functional disabilities. About IV Choline Chloride IV Choline Chloride is an investigational, intravenous phospholipid substrate replacement therapy in development for patients receiving parenteral support (PS). Choline is a known important substrate for phospholipids that are critical for healthy liver function that also play an important role in modulating gene expression, cell membrane signaling, brain development and neurotransmission, muscle function, and bone health. PS patients are unable to synthesize choline from enteral nutrition sources, and there are currently no available PS formulations containing choline. Approximately 78% of patients dependent on PS are choline-deficient and of those approximately 63% have some degree of liver dysfunction, which can lead to hepatic failure. Every year in the U.S. there are approximately 90,000 people who require PS at home and of those approximately 30,000 are on long-term PS. IV Choline Chloride has the potential to become the first U.S. Food and Drug Administration (FDA) approved IV choline formulation for PS patients. It has been granted Orphan Drug Designation by the FDA for the prevention and/or treatment of choline deficiency in patients on long-term PN and been granted Fast Track Designation as a source of choline when oral or enteral nutrition is not possible, insufficient, or contraindicated. The U.S. Patent and Trademark Office has issued us a U.S. patent claiming a choline composition and a U.S. patent claiming a method for treating choline deficiency with a choline composition, each with a term expiring in 2041. About Protara Therapeutics, Inc. Protara is a clinical-stage biotechnology company committed to advancing transformative therapies for people with cancer and rare diseases. Protara’s portfolio includes its lead candidate, TARA-002, an investigational cell-based therapy in development for the treatment of non-muscle invasive bladder cancer (NMIBC) and lymphatic malformations (LMs). The Company is evaluating TARA-002 in an ongoing Phase 2 trial in NMIBC patients with carcinoma in situ (CIS) who are unresponsive or naïve to treatment with Bacillus Calmette-Guérin (BCG), as well as a Phase 2 trial in pediatric patients with LMs. Additionally, Protara is developing IV Choline Chloride, an investigational phospholipid substrate replacement for patients on parenteral nutrition who are otherwise unable to meet their choline needs via oral or enteral routes. For more information, visit www.protaratx.com. Forward-Looking Statements Statements contained in this press release regarding matters that are not historical facts are "forward looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. Protara may, in some cases, use terms such as “predicts,” “believes,” “potential,” “proposed,” “continue,” “designed,” “estimates,” “anticipates,” “expects,” “plans,” “intends,” “may,” “could,” “might,” “will,” “should” or other words or expressions referencing future events, conditions or circumstances that convey uncertainty of future events or outcomes to identify these forward-looking statements. Such forward-looking statements include but are not limited to, statements regarding Protara’s intentions, beliefs, projections, outlook, analyses or current expectations concerning, among other things: Protara’s business strategy, including its development plans for its product candidates and plans regarding the timing or outcome of existing or future clinical trials (including the timing of any particular phases of such trials and the timing of the announcement of any data produced during such trials or phases thereof); statements related to expectations regarding interactions with the U.S. Food and Drug Administration (FDA); Protara’s financial position; statements regarding the anticipated safety or efficacy of Protara’s product candidates; and Protara’s outlook for the remainder of the year and future periods. Because such statements are subject to risks and uncertainties, actual results may differ materially from those expressed or implied by such forward-looking statements. Factors that contribute to the uncertain nature of the forward-looking statements include: risks that Protara’s financial guidance may not be as expected, as well as risks and uncertainties associated with: Protara’s development programs, including the initiation and completion of non-clinical studies and clinical trials and the timing of required filings with the FDA and other regulatory agencies; general market conditions; changes in the competitive landscape; changes in Protara’s strategic and commercial plans; Protara’s ability to obtain sufficient financing to fund its strategic plans and commercialization efforts; having to use cash in ways or on timing other than expected; the impact of market volatility on cash reserves; failure to attract and retain management and key personnel; the impact of general U.S. and foreign, economic, industry, market, regulatory, political or public health conditions; and the risks and uncertainties associated with Protara’s business and financial condition in general, including the risks and uncertainties described more fully under the caption “Risk Factors” and elsewhere in Protara's filings and reports with the United States Securities and Exchange Commission. All forward-looking statements contained in this press release speak only as of the date on which they were made and are based on management's assumptions and estimates as of such date. Protara undertakes no obligation to update any forward-looking statements, whether as a result of the receipt of new information, the occurrence of future events or otherwise, except as required by law. Company Contact: Justine O'Malley Protara Therapeutics [email protected] 646-817-2836

Reported positive interim results demonstrating durable responses in the ongoing Phase 2 ADVANCED-2 trial of TARA-002 in NMIBC Results from planned interim analysis of approximately 25 six-month evaluable BCG-Unresponsive patients expected by the end of 2025 Dosing of first patient in THRIVE-3 registrational trial of IV Choline Chloride in patients dependent on parenteral support expected in Q3 2025 Strengthened leadership team with key appointments of Leonardo Viana Nicacio, M.D., as Chief Medical Officer, and Shane Williams, Ph.D., as VP, Head of Human Resources, Chief People Officer Cash, cash equivalents and investments of $158 million as of March 31, 2025, expected to support planned operations into 2027 NEW YORK, May 08, 2025 (GLOBE NEWSWIRE) -- Protara Therapeutics, Inc. (Nasdaq: TARA), a clinical-stage company developing transformative therapies for the treatment of cancer and rare diseases, today announced financial results for the first quarter ended March 31, 2025, and provided a business update. “We have made significant progress thus far in 2025, notably with the recent presentation of positive interim results from our ADVANCED-2 trial of TARA-002 in BCG-Unresponsive and BCG-Naïve patients which demonstrated durable 12-month landmark responses,” said Jesse Shefferman, Chief Executive Officer of Protara Therapeutics. “We believe TARA-002 is well positioned to make a meaningful difference in the lives of patients with non-muscle invasive bladder cancer (NMIBC). In addition to our NMIBC program, we are pleased with the continued progress we have made across our rare disease programs and look forward to several exciting data milestones in the coming months.” Recent Progress and Highlights TARA-002 in NMIBC At the American Urological Association (AUA) 2025 Annual Meeting in April, the Company announced positive updated interim results from the ADVANCED-2 trial in evaluable NMIBC patients with carcinoma in situ or CIS (± Ta/T1) who are Bacillus Calmette-Guérin (BCG)-Unresponsive and BCG-Naïve. As of the April 16, 2025 data cutoff: TARA-002 demonstrated a complete response (CR) rate at any time of 100% (5/5) and 67% (2/3) at 12 months in the cohort of BCG-Unresponsive patients. As previously communicated, the BCG-Unresponsive cohort is designed to be registrational in alignment with the 2024 BCG-Unresponsive Non-muscle Invasive Bladder Cancer: Developing Drugs and Biological Products for Treatment Draft Guidance for Industry issued by the U.S. Food and Drug Administration (FDA). In the proof-of-concept BCG-Naïve cohort of patients, TARA-002 demonstrated a CR rate at any time of 76% (16/21) and a CR rate of 43% (3/7) at 12 months. The majority of adverse events were Grade 1 and transient, with no Grade 3 or greater treatment-related adverse events as assessed by study investigators. Interim results from approximately 25 six-month evaluable BCG-Unresponsive patients are expected to be announced by the end of 2025. Following regulatory alignment with the FDA, the Company expects to provide an update on the design of its planned BCG-Naïve registrational trial in the second half of 2025. Protara continues to investigate subcutaneous dosing through priming and maintenance combined with intravesical dosing, as well as exploring combination treatment with TARA-002 in NMIBC patients with CIS. IV Choline Chloride for Patients on Parenteral Support (PS) The Company plans to initiate THRIVE-3, a registrational Phase 3 clinical trial, in the third quarter of 2025. THRIVE-3 is a seamless Phase 2b/3 trial with a dose confirmation portion (n=24) followed by a double-blinded, randomized, placebo-controlled portion to assess the efficacy and safety of IV Choline Chloride over 24 weeks in adolescents and adults on long-term PS when oral or enteral nutrition is not possible, insufficient, or contraindicated (n=105). IV Choline Chloride was previously granted Fast Track designation by the FDA. TARA-002 in LMs Dosing continues to progress in the Phase 2 STARBORN-1 trial of TARA-002 in pediatric patients with macrocystic and mixed cystic LMs and the Company intends to provide an interim update from the trial in the second half of 2025. The Company previously announced the completion of the study’s first safety cohort, in which TARA-002 showed promising results and was generally well-tolerated. Corporate Update In April 2025, Protara strengthened its leadership team with the appointments of Leonardo Viana Nicacio, M.D., as Chief Medical Officer, and Shane Williams, Ph.D., as Vice President, Head of Human Resources, Chief People Officer. Dr. Nicacio brings to Protara nearly 20 years of broad oncology, drug development, regulatory and commercial experience across leading biopharmaceutical and health technology companies, and most recently served as Head of Clinical Development and Global Medical Affairs at Stemline Therapeutics. Dr. Williams brings a strong track record of driving growth, leading transformational change, and building high-performing teams across innovative life science organizations. He most recently served as Chief People Officer at Century Therapeutics. First Quarter 2025 Financial Results As of March 31, 2025, unrestricted cash and cash equivalents and investments in marketable debt securities totaled $157.5 million. The Company expects its cash, cash equivalents, and investments in marketable debt securities will be sufficient to fund operations into 2027. Research and development expenses for the first quarter of 2025 increased to $9.1 million from $7.7 million for the prior year period. The increase was primarily due to a $2.6 million increase in clinical trial activities for TARA-002 and IV Choline, offset by a $1.2 million decrease in indirect expenses. General and administrative expenses for the first quarter of 2025 increased to $5.0 million from $4.1 million for the prior year period. This increase was primarily due to a $0.4 million increase in personnel-related costs as well as an increase of professional fees of $0.4 million. For the first quarter of 2025, Protara incurred a net loss of $11.9 million, or $0.29 per share, compared with a net loss of $11.1 million, or $0.97 per share, for the same period in 2024. Net loss for the first quarter of 2025 included approximately $0.8 million of stock-based compensation expenses. About TARA-002 TARA-002 is an investigational cell therapy in development for the treatment of NMIBC and of LMs, for which it has been granted Rare Pediatric Disease Designation by the U.S. Food and Drug Administration. TARA-002 was developed from the same master cell bank of genetically distinct group A Streptococcus pyogenes as OK-432, a broad immunopotentiator marketed as Picibanil® in Japan by Chugai Pharmaceutical Co., Ltd. Protara has successfully shown manufacturing comparability between TARA-002 and OK-432. When TARA-002 is administered, it is hypothesized that innate and adaptive immune cells within the cyst or tumor are activated and produce a pro-inflammatory response with release of cytokines such as tumor necrosis factor (TNF)-alpha, interferon (IFN)-gamma IL-6, IL-10, IL-12. TARA-002 also directly kills tumor cells and triggers a host immune response by inducing immunogenic cell death, which further enhances the antitumor immune response. About Non-Muscle Invasive Bladder Cancer (NMIBC) Bladder cancer is the 6th most common cancer in the United States, with NMIBC representing approximately 80% of bladder cancer diagnoses. Approximately 65,000 patients are diagnosed with NMIBC in the United States each year. NMIBC is cancer found in the tissue that lines the inner surface of the bladder that has not spread into the bladder muscle. About Lymphatic Malformations (LMs) LMs are rare, congenital malformations of lymphatic vessels resulting in the failure of these structures to connect or drain into the venous system. Most LMs are present in the head and neck region and are diagnosed in early childhood during the period of active lymphatic growth, with more than 50% detected at birth and 90% diagnosed before the age of three years. The most common morbidities and serious manifestations of the disease include compression of the upper aerodigestive tract, including airway obstruction requiring intubation and possible tracheostomy dependence; intralesional bleeding; impingement on critical structures, including nerves, vessels, lymphatics; recurrent infection, and cosmetic and other functional disabilities. About IV Choline Chloride IV Choline Chloride is an investigational, intravenous phospholipid substrate replacement therapy in development for patients receiving parenteral support (PS). Choline is a known important substrate for phospholipids that are critical for healthy liver function that also play an important role in modulating gene expression, cell membrane signaling, brain development and neurotransmission, muscle function, and bone health. PS patients are unable to synthesize choline from enteral nutrition sources, and there are currently no available PS formulations containing choline. Approximately 80% of patients dependent on PS are choline-deficient and of those approximately 63% have some degree of liver dysfunction, which can lead to hepatic failure. Every year in the U.S. there are approximately 90,000 people who require PS at home and of those approximately 30,000 are on long-term PS. IV Choline Chloride has the potential to become the first U.S. Food and Drug Administration (FDA) approved IV choline formulation for PS patients. It has been granted Orphan Drug Designation by the FDA for the prevention and/or treatment of choline deficiency in patients on long-term PN and been granted Fast Track Designation as a source of choline when oral or enteral nutrition is not possible, insufficient, or contraindicated. The U.S. Patent and Trademark Office has issued us a U.S. patent claiming a choline composition and a U.S. patent claiming a method for treating choline deficiency with a choline composition, each with a term expiring in 2041. About Protara Therapeutics, Inc. Protara is a clinical-stage biotechnology company committed to advancing transformative therapies for people with cancer and rare diseases. Protara’s portfolio includes its lead candidate, TARA-002, an investigational cell-based therapy in development for the treatment of non-muscle invasive bladder cancer (NMIBC) and lymphatic malformations (LMs). The Company is evaluating TARA-002 in an ongoing Phase 2 trial in NMIBC patients with carcinoma in situ (CIS) who are unresponsive or naïve to treatment with Bacillus Calmette-Guérin (BCG), as well as a Phase 2 trial in pediatric patients with LMs. Additionally, Protara is developing IV Choline Chloride, an investigational phospholipid substrate replacement for patients on parenteral nutrition who are otherwise unable to meet their choline needs via oral or enteral routes. For more information, visit www.protaratx.com. Forward-Looking Statements Statements contained in this press release regarding matters that are not historical facts are "forward looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. Protara may, in some cases, use terms such as “predicts,” “believes,” “potential,” “proposed,” “continue,” “designed,” “estimates,” “anticipates,” “expects,” “plans,” “intends,” “may,” “could,” “might,” “will,” “should” or other words or expressions referencing future events, conditions or circumstances that convey uncertainty of future events or outcomes to identify these forward-looking statements. Such forward-looking statements include but are not limited to, statements regarding Protara’s intentions, beliefs, projections, outlook, analyses or current expectations concerning, among other things: Protara’s business strategy, including its development plans for its product candidates and plans regarding the timing or outcome of existing or future clinical trials (including reporting data from approximately 25 6-month evaluable BCG-Unresponsive patients by the end of 2025); statements related to expectations regarding interactions with the U.S. Food and Drug Administration (FDA); Protara’s financial position; statements regarding the anticipated safety or efficacy of Protara’s product candidates; and Protara’s outlook for the remainder of the year and future periods. Because such statements are subject to risks and uncertainties, actual results may differ materially from those expressed or implied by such forward-looking statements. Factors that contribute to the uncertain nature of the forward-looking statements include: risks that Protara’s financial guidance may not be as expected, as well as risks and uncertainties associated with: Protara’s development programs, including the initiation and completion of non-clinical studies and clinical trials and the timing of required filings with the FDA and other regulatory agencies; general market conditions; changes in the competitive landscape; changes in Protara’s strategic and commercial plans; Protara’s ability to obtain sufficient financing to fund its strategic plans and commercialization efforts; having to use cash in ways or on timing other than expected; the impact of market volatility on cash reserves; failure to attract and retain management and key personnel; the impact of general U.S. and foreign, economic, industry, market, regulatory, political or public health conditions; and the risks and uncertainties associated with Protara’s business and financial condition in general, including the risks and uncertainties described more fully under the caption “Risk Factors” and elsewhere in Protara's filings and reports with the United States Securities and Exchange Commission. All forward-looking statements contained in this press release speak only as of the date on which they were made and are based on management's assumptions and estimates as of such date. Protara undertakes no obligation to update any forward-looking statements, whether as a result of the receipt of new information, the occurrence of future events or otherwise, except as required by law. Company Contact: Justine O'Malley Protara Therapeutics [email protected] 646-817-2836