PLRX

FORTIFY, a Phase 1b indication expansion trial of PLN-101095, experiencing strong enrollment Appointed seasoned oncology drug development leaders Flavia Borellini, Ph.D. and Robert Iannone, M.D., M.S.C.E. to Board of Directors SOUTH SAN FRANCISCO, Calif., Aug. 11, 2026 (GLOBE NEWSWIRE) -- Pliant Therapeutics, Inc. (Nasdaq: PLRX), a clinical-stage biotechnology company focused on the discovery and development of integrin-based therapeutics, today provided a corporate update and reported second quarter 2026 financial results. “In the second quarter, we continued to execute across the portfolio, led by strong enrollment in FORTIFY,” said Bernard Coulie, M.D., Ph.D., President and Chief Executive Officer of Pliant. “With the appointments of Flavia and Robert to the board, Pliant now has deep global oncology drug development and commercialization expertise at this important time for our oncology program. We continue to make progress on our proprietary integrin-targeted drug-delivery platform and look forward to sharing more information on the platform soon.” Oncology ProgramPLN-101095 is an oral, small molecule, dual selective inhibitor of αvβ8 and αvβ1 integrins designed to overcome checkpoint resistance by blocking TGF-β activation in the tumor microenvironment. Pliant is currently conducting FORTIFY, a Phase 1a/1b open-label, dose-escalation and indication expansion trial (NCT0670706), to evaluate the safety, tolerability, pharmacokinetics, and preliminary evidence of antitumor activity of PLN-101095, in combination with pembrolizumab, in patients with immune checkpoint inhibitor (ICI)-refractory advanced or metastatic solid tumors. Enrollment continues in FORTIFY, a Phase 1b indication expansion trial. FORTIFY will enroll up to 102 patients across three cohorts including non-small cell lung cancer (NSCLC), clear cell renal cell carcinoma (ccRCC) and tumors with high tumor mutational burden. Patients are treated for 14 days with PLN-101095 dosed at 1,000 mg twice daily as monotherapy, after which pembrolizumab is added as combination therapy. Enrollment remains strong, progressing ahead of schedule. Interim data is expected in 2027. Oral presentation at AACR of updated PLN-101095 Phase 1 data highlights monotherapy biomarker data showing a coordinated T-cell reactivation cascade in responders. In July, at the American Association for Cancer Research’s (AACR) Drug Discovery and Development conference, the Company reviewed encouraging PLN-101095 Phase 1 monotherapy biomarker data. As previously reported, all responding patients showed large increases in plasma interferon gamma (IFN-γ), a modulator of anti-tumor immunity, after 14 days of monotherapy with PLN-101095. Updated data show that blocking of αvβ8 by PLN-101095 also resulted in increases in CXCL9, a recruiter of T cells, and granzyme-B, a marker for cytotoxic arming in responding patients. Increased IFN-γ, CXCL9 and granzyme-B after PLN-101095 monotherapy signals a shift in the tumor microenvironment that could potentially resensitize tumors to pembrolizumab. Importantly, no non-responders experienced increases in these biomarkers. Integrin-Targeted Delivery Platform Utilizing cell-specific integrin receptors, Pliant has developed a platform to deliver drug payloads, including siRNAs, to selective tissue types. Current programs are focused on delivering siRNAs to skeletal muscle cells and other tissues. Preclinical proof-of-concept studies are currently ongoing. The Company believes this integrin-targeting drug-delivery platform has the potential for broad applicability across multiple disease areas utilizing a variety of drug payloads. Pliant plans to provide additional detail on the platform and path forward, including initial treatment indications, in the second half of 2026. Corporate Highlights Appointed Flavia Borellini, Ph.D. and Robert Iannone, M.D., M.S.C.E. to the Company’s Board of Directors. Dr. Borellini brings more than 25 years of executive management experience in the biopharmaceutical industry with a focus on the global development of targeted oncology drugs from preclinical to commercial stage. Dr. Iannone, who currently serves as Executive Vice President, Research and Development and Chief Medical Officer at Jazz Pharmaceuticals, brings more than two decades of executive drug development and regulatory leadership, including the approval of several targeted and immuno-oncology medicines. Second Quarter 2026 Financial Results Research and development expenses were $16.7 million, as compared to $32.2 million for the prior-year quarter. The decrease was primarily due to completing close-out activities for BEACON-IPF, a Phase 2b/3 study of bexotegrast, in 2025 and reduced personnel-related expenses, including stock based compensation, driven by decreased headcount compared to prior year. General and administrative expenses were $7.1 million, as compared to $13.4 million for the prior-year quarter. The decrease was primarily due to personnel-related expenses, including stock-based compensation, driven by decreased headcount compared to prior year. Net loss was $22.4 million as compared to $43.3 million for the prior-year quarter. The decrease was primarily due to significantly lower operating expenses following the termination of bexotegrast development in IPF in 2025 and decreased personnel-related expenses, including stock-based compensation, driven by reduced headcount compared to prior year. As of June 30, 2026, the Company had cash, cash equivalents and short-term investments of $159.6 million which the Company expects to be sufficient to fund operations into the second half of 2028. About Pliant Therapeutics, Inc. Pliant Therapeutics is a clinical-stage biopharmaceutical company focused on the discovery and development of integrin-based therapeutics. Pliant’s lead program is PLN-101095, a small molecule, dual-selective inhibitor of αvß8 and αvß1 integrins, that is being developed for the treatment of ICI-refractory advanced or metastatic solid tumors. PLN-101095 is being investigated in FORTIFY, a Phase 1b indication expansion trial, enrolling patients with NSCLC, tumors with high tumor mutational burden or clear cell renal cell carcinoma. Pliant’s preclinical research is focused on tissue-specific delivery and internalization of drug payloads utilizing integrin receptor-binding molecules with programs focused on delivering siRNAs to skeletal muscle cells, adipocytes, and renal cells. For additional information, please visit: www.PliantRx.com. Follow Pliant on social media at X, LinkedIn and Facebook. Forward-Looking StatementsStatements 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. Words such as "may," "will," "expect," "anticipate," "estimate," "intend," and similar expressions (as well as other words or expressions referencing future events, conditions, or circumstances) are intended to identify forward-looking statements. These statements include express or implied statements regarding ongoing clinical trial development of PLN-101095, including timing of enrollment and data; the potential benefits of PLN-101095; and Pliant’s plans for the continued development of PLN-101095; and plans for its integrin-based drug delivery platform, including timing of additional details, including initial treatment indications; among others. Because such statements deal with future events and are based on Pliant’s current expectations, they are subject to various risks and uncertainties and actual results, performance or achievements of Pliant could differ materially from those described in or implied by the statements in this press release. These risks and uncertainties, including those related to the development and commercialization of Pliant’s product candidates, including any delays in Pliant’s ongoing or planned preclinical studies or clinical trials, the impact of current macroeconomic, geopolitical and marketplace conditions on Pliant’s business, operations, clinical supply and plans, Pliant’s reliance on single-source third parties located in foreign jurisdictions, including China, for critical aspects of Pliant development operations, the risks inherent in the drug development process, the risks regarding the accuracy of Pliant’s estimates of expenses and timing of development, its capital requirements and the sufficiency of its cash to support Pliant’s planned operations, and Pliant’s ability to obtain and maintain intellectual property protection for Pliant’s product candidates. These and additional risks are discussed in the sections titled "Management's Discussion and Analysis of Financial Condition and Results of Operations" and "Risk Factors" in Pliant’s Quarterly Report on Form 10-Q for the period ended June 30, 2026, which Pliant is filing with the Securities and Exchange Commission (SEC) today, and which will be available on the SEC's website at www.sec.gov, as well as other risks or uncertainties set forth in Pliant’s future SEC filings. Unless otherwise noted, Pliant is providing this information as of the date of this news release and does not undertake any obligation to update any forward-looking statements contained in this document as a result of new information, future events or otherwise. Investor and Media Contact:Christopher KeenanVice President, Investor Relations and Corporate CommunicationsPliant Therapeutics, [email protected]

First participant dosed in FORTIFY, a Phase 1b indication expansion trial of PLN-101095 Oral presentation at AACR 2026 featured updated data from Phase 1 trial of PLN-101095 showing deepening of confirmed responses in checkpoint inhibitor-refractory solid tumors PLN-101095 spotlighted as novel IO approach as part of AACR's 2026 Highlights Plenary Session SOUTH SAN FRANCISCO, Calif., May 11, 2026 (GLOBE NEWSWIRE) -- Pliant Therapeutics, Inc. (Nasdaq: PLRX), a clinical-stage biotechnology company focused on the discovery and development of integrin-based therapeutics, today provided a corporate update and reported first quarter 2026 financial results. “In the first quarter, our team showcased its clinical development capabilities, initiating FORTIFY, the Phase 1b trial of PLN-101095, ahead of schedule and dosing the first patient in April,” said Bernard Coulie, M.D., Ph.D., President and Chief Executive Officer of Pliant. “We were excited to highlight encouraging recent data from the Phase 1a trial of PLN-101095 at AACR showing deepening responses and increasing time on treatment. The team continues to make progress on pipeline programs emerging from Pliant's proprietary integrin platform while evaluating opportunities to expand our clinical-stage pipeline.” Oncology Program PLN-101095 is an oral, small molecule, dual selective inhibitor of αvβ8 and αvβ1 integrins designed to overcome checkpoint resistance by blocking TGF-β activation in the tumor microenvironment. Pliant is currently conducting a Phase 1a/1b open-label, dose-escalation and indication expansion trial (NCT0670706) to evaluate the safety, tolerability, pharmacokinetics, and preliminary evidence of antitumor activity of PLN-101095, as monotherapy and in combination with pembrolizumab, in patients with immune checkpoint inhibitor (ICI)-refractory advanced or metastatic solid tumors. FORTIFY, a Phase 1b indication expansion trial, enrolling and dosing patients. In April, the Company announced the dosing of its first participant in the FORTIFY Phase 1b indication expansion trial. The Phase 1b open-label, single dose trial will enroll three cohorts of patients including non-small cell lung cancer (NSCLC), clear cell renal cell carcinoma and a subset of tumors with high tumor mutational burden. Tumor selection was based on data from the Phase 1 trial, as well as strong mechanistic rationale for integrin inhibition. Patients will be treated for 14 days with PLN-101095 dosed at 1,000 mg twice daily as monotherapy, after which pembrolizumab will be added as combination therapy. Enrollment is underway with interim data expected in 2027. Oral presentation at AACR of updated Phase 1 data from PLN-101095 highlighted deepening of confirmed responses. In April, at the Clinical Trials Mini Symposium of the American Association for Cancer Research (AACR) 2026 Annual Meeting, the Company announced positive updated data from its Phase 1 trial of PLN-101095. Results showed that, in a heavily pretreated patient population, PLN-101095 demonstrated anti-tumor activity in combination with pembrolizumab, an FDA-approved ICI. One confirmed overall complete response, two confirmed overall partial responses, including one patient with a complete response of baseline target lesions, and one unconfirmed partial response were reported. These clinical responses were observed in patients with cholangiocarcinoma, NSCLC, melanoma and head and neck squamous cell carcinoma, respectively. All responding patients showed large increases in plasma interferon gamma (IFN-γ) after 14 days of monotherapy with PLN-101095 prior to the addition of pembrolizumab. At Week 10, all responders maintained more than a 2-fold increase in IFN-γ. No non-responders showed meaningful increases in plasma IFN- γ. PLN-101095 was generally well tolerated across all doses tested. IFN-γ is known to play a multifaceted role in modulating anti-tumor immunity, with increased tumor expression levels having previously been linked with better outcomes from immune checkpoint blockade. In addition to IFN- γ increases, all responding patients showed elevated plasma PD-L1 levels, known to be induced by increased IFN-γ and a predictor of an improved ICI response. Additionally, PLN-101095 was spotlighted as a novel immunotherapy approach as part of AACR’s 2026 Annual Meeting Highlights Plenary Session. Integrin-Targeted Delivery Platform Utilizing cell-specific integrin receptors, Pliant has developed a platform to deliver drug payloads, including siRNAs, to selective tissue types. Current programs are focused on delivering siRNAs to skeletal muscle cells and other tissues. Preclinical proof-of-concept studies are currently ongoing. The Company believes this integrin-targeting drug-delivery platform has the potential for broad applicability across multiple disease areas utilizing a variety of drug payloads. First Quarter 2026 Financial Results Research and development expenses were $13.6 million, as compared to $43.4 million for the prior-year quarter. The decrease was primarily due to completing close-out activities for BEACON-IPF, a Phase 2b/3 study of bexotegrast, in 2025 and reduced personnel-related expenses, including stock based compensation, driven by decreased headcount compared to prior year. General and administrative expenses were $8.2 million, as compared to $15.5 million for the prior-year quarter. The decrease was primarily due to personnel-related expenses, including stock-based compensation, driven by decreased headcount compared to prior year. Net loss was $20.0 million as compared to $56.2 million for the prior-year quarter. The decrease was primarily due to significantly lower operating expenses following the termination of bexotegrast development in IPF in 2025 and decreased personnel-related expenses, including stock-based compensation, driven by reduced headcount compared to prior year. As of March 31, 2026, the Company had cash, cash equivalents and short-term investments of $172.4 million which the Company expects to be sufficient to fund operations into the second half of 2028. About Pliant Therapeutics, Inc. Pliant Therapeutics is a clinical-stage biopharmaceutical company focused on the discovery and development of integrin-based therapeutics. Pliant’s lead program is PLN-101095, a small molecule, dual-selective inhibitor of αvß8 and αvß1 integrins, that is being developed for the treatment of ICI-refractory advanced or metastatic solid tumors. PLN-101095 is being investigated in FORTIFY, a Phase 1b indication expansion trial enrolling patients with NSCLC, tumors with high tumor mutational burden or clear cell renal cell carcinoma. Pliant’s preclinical research is focused on tissue-specific delivery and internalization of drug payloads utilizing integrin receptor-binding molecules with programs focused on delivering siRNAs to skeletal muscle cells, adipocytes, and renal cells. For additional information, please visit: www.PliantRx.com. Follow Pliant on social media at X, LinkedIn and Facebook. 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. Words such as "may," "will," "expect," "anticipate," "estimate," "intend," and similar expressions (as well as other words or expressions referencing future events, conditions, or circumstances) are intended to identify forward-looking statements. These statements include express or implied statements regarding ongoing clinical trial development of PLN-101095, including timing of enrollment and data; the potential benefits of PLN-101095; and Pliant’s plans for the continued development of PLN-101095 among others, including its integrin-based drug delivery platform. Because such statements deal with future events and are based on Pliant’s current expectations, they are subject to various risks and uncertainties and actual results, performance or achievements of Pliant could differ materially from those described in or implied by the statements in this press release. These forward-looking statements are subject to risks and uncertainties, including those related to the development and commercialization of Pliant’s product candidates, including any delays in Pliant’s ongoing or planned preclinical or clinical trials, the impact of current macroeconomic, geopolitical and marketplace conditions on Pliant’s business, operations, clinical supply and plans, Pliant’s reliance on single-source third parties located in foreign jurisdictions, including China, for critical aspects of Pliant development operations, the risks inherent in the drug development process, the risks regarding the accuracy of Pliant’s estimates of expenses and timing of development, its capital requirements and the sufficiency of its cash to support Pliant’s planned operations, and Pliant’s ability to obtain and maintain intellectual property protection for Pliant’s product candidates. These and additional risks are discussed in the sections titled "Management's Discussion and Analysis of Financial Condition and Results of Operations" and "Risk Factors" in Pliant’s Quarterly Report on Form 10-Q for the period ended March 31, 2026, which Pliant is filing with the Securities and Exchange Commission (SEC) today, and which will be available on the SEC's website at www.sec.gov. Unless otherwise noted, Pliant is providing this information as of the date of this news release and does not undertake any obligation to update any forward-looking statements contained in this document as a result of new information, future events or otherwise. Investor and Media Contact: Christopher Keenan Vice President, Investor Relations and Corporate Communications Pliant Therapeutics, Inc. [email protected]

PLN-101095 Phase 1 data showed deep and durable ongoing responses in checkpoint inhibitor refractory solid tumors PLN-101095 accelerated development plan underway with initiation of Phase 1b indication expansion trial SOUTH SAN FRANCISCO, Calif., March 11, 2026 (GLOBE NEWSWIRE) -- Pliant Therapeutics, Inc. (Nasdaq: PLRX), a clinical-stage biotechnology company focused on the discovery and development of integrin-based therapeutics, today provided a corporate update and reported fourth quarter 2025 financial results. “We ended 2025 with encouraging data from our lead oncology program in ICI-refractory patients, an area of unmet medical need, that informed the initiation of our accelerated development plan for PLN-101095,” said Bernard Coulie, M.D., Ph.D., President and Chief Executive Officer of Pliant. “In addition to oncology and the early-stage pipeline programs emerging from Pliant's proprietary integrin platform, we continue to assess opportunities to expand our clinical-stage pipeline that leverage our areas of expertise and align with creating shareholder value.” Fourth Quarter and Recent Developments Oncology Program PLN-101095 is an oral, small molecule, dual selective inhibitor of αvβ8 and αvβ1 integrins designed to overcome checkpoint resistance by blocking TGF-β activation in the tumor microenvironment. Pliant is currently conducting a Phase 1a/1b open-label, dose-escalation and indication expansion trial to evaluate the safety, tolerability, pharmacokinetics, and preliminary evidence of antitumor activity of PLN-101095, as monotherapy and in combination with pembrolizumab, in patients with immune checkpoint inhibitor (ICI)-refractory advanced or metastatic solid tumors. Data from the Phase 1 trial of PLN-101095 showed deep and durable ongoing responses. In December, the Company announced positive data showing that, in a heavily pretreated patient population, PLN-101095 demonstrated anti-tumor activity in combination with pembrolizumab, an FDA-approved ICI. Four responders were observed consisting of one confirmed complete response and three partial responses (two confirmed, one unconfirmed) out of the 10 secondary ICI refractory patients. These clinical responses were observed in patients with cholangiocarcinoma, melanoma, head and neck squamous cell carcinoma and non-small cell lung cancer (NSCLC). Notably, all responding patients showed large increases in plasma interferon gamma (IFN-γ) after 14 days of monotherapy with PLN-101095 prior to the addition of pembrolizumab. No non-responders showed meaningful increases in plasma IFN- γ. PLN-101095 was generally well tolerated across all doses tested. IFN-γ is known to play a multifaceted role in modulating anti-tumor immunity, with increased tumor expression levels having previously been linked with better outcomes from immune checkpoint blockade. Accelerated development plan of PLN-101095 underway with initiation of Phase 1b indication expansion trial. Based on the encouraging response data and supportive IFN- γ biomarker data from the Phase 1 trial, the Company is advancing an accelerated clinical development plan of PLN-101095 and has initiated a Phase 1b indication expansion trial. The Phase 1b open-label, single dose trial will enroll three cohorts of patients including NSCLC, clear cell renal cell carcinoma and tumors with high tumor mutational burden. Tumor selection was based on data from the Phase 1 trial, as well as strong mechanistic rationale for integrin inhibition. Patients will be treated for 14 days with PLN-101095 dosed at 1,000 mg twice daily as monotherapy, after which pembrolizumab will be added as combination therapy. Study start activities for this trial are underway with first patient enrollment anticipated in second quarter. Interim data is expected in 2027. PLN-101095 Phase 1 data accepted for presentation at AACR Annual Meeting 2026. Data from the Phase 1 trial of PLN-101095 will be the subject of a poster presentation and an oral presentation as part of the Clinical Trials Minisymposium at the upcoming American Association of Cancer Research (AACR) conference to be held April 17-22, 2026, in San Diego, California. Integrin-Targeted Delivery Platform Utilizing cell-specific integrin receptors, Pliant has developed a platform to deliver drug payloads, including siRNAs, to selective tissue types. Current programs are focused on delivering siRNAs to skeletal muscle cells and other tissues. The Company believes this integrin-targeting delivery platform has the potential for broad applicability across multiple disease areas utilizing a variety of drug payloads. Corporate Highlights Appointment of Minnie Kuo as Chief Operating Officer. Ms. Kuo joined Pliant in September 2023 as Chief Development Officer, bringing more than 20 years of multinational clinical development experience across various therapeutic areas. In this expanded role, Ms. Kuo bridges Pliant’s science and operations with oversight of clinical operations, early development, program management, regulatory affairs and compliance. INTEGRIS-PSC results published in the Journal of Hepatology. The manuscript, “Phase II INTEGRIS-PSC trial of bexotegrast, an αvβ6 and αvβ1 integrin inhibitor, in primary sclerosing cholangitis”, appears in the January 2026 issue of the Journal of Hepatology. Fourth Quarter 2025 Financial Results Research and development expenses were $15.6 million as compared to $38.8 million for the prior-year quarter. The decrease was primarily driven by the discontinuation of BEACON-IPF. General and administrative expenses were $8.0 million as compared to $14.5 million for the prior-year quarter. The decrease was primarily due to lower personnel-related costs resulting from the strategic restructuring of our workforce. Net loss was $23.6 million as compared to $49.7 million for the prior-year quarter. The decrease was primarily attributable to the discontinuation of BEACON-IPF coupled with the decrease in personnel-related costs resulting from the strategic restructuring of our workforce. As of December 31, 2025, the Company had cash, cash equivalents and short-term investments of $192.4 million which the Company expects to be sufficient to fund operations into the second half of 2028. About Pliant Therapeutics, Inc. Pliant Therapeutics is a clinical-stage biopharmaceutical company focused on the discovery and development of integrin-based therapeutics. The Company’s lead program is PLN-101095, a small molecule, dual-selective inhibitor of αvß8 and αvß1 integrins, that is being developed for the treatment of solid tumors. Pliant’s early-stage platform includes preclinical research focused on tissue-specific delivery and internalization of drug payloads utilizing integrin receptor-binding molecules. For additional information, please visit: www.PliantRx.com. Follow us on social media X, LinkedIn and Facebook. 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. Words such as "may," "will," "expect," "anticipate," "estimate," "intend," and similar expressions (as well as other words or expressions referencing future events, conditions, or circumstances) are intended to identify forward-looking statements. These express or implied statements include those regarding PLN-101095's development plan, including anticipated timing of data from our ongoing Phase 1 trial and our Phase 1b indication expansion trial, expansion of our clinical-stage pipeline and creation of shareholder value, and the potential of our integrin-targeted delivery platform, among others. Because such statements deal with future events and are based on our current expectations, they are subject to various risks and uncertainties and our actual results, performance or achievements could differ materially from those described in or implied by the statements in this press release. These forward-looking statements are subject to risks and uncertainties, including those related to the clinical development of our product candidates, including any delays in our ongoing or planned preclinical or clinical trials, or interactions with regulators, as well as the impact of current macroeconomic, geopolitical and marketplace conditions on our business, operations, clinical supply and plans, our reliance on single-source third parties located in foreign jurisdictions, including China, for critical aspects of our development operations, the risks inherent in the drug development process, the risks regarding the accuracy of our estimates of expenses and timing of development, our capital requirements and the need for additional financing, and our ability to obtain and maintain intellectual property protection for our product candidates. These and additional risks are discussed in the sections titled "Risk Factors" and "Management's Discussion and Analysis of Financial Condition and Results of Operations" in our Annual Report on Form 10-K for the period ended December 31, 2025 which we are filing with the SEC today, available on the SEC's website at www.sec.gov. Unless otherwise noted, Pliant is providing this information as of the date of this news release and does not undertake any obligation to update any forward-looking statements contained in this document as a result of new information, future events or otherwise. Investor and Media Contact: Christopher Keenan Vice President, Investor Relations and Corporate Communications Pliant Therapeutics, Inc. [email protected]

Oncology program advancing with data expected in the fourth quarter 2025 BEACON-IPF close out activities to be completed in the fourth quarter 2025 SOUTH SAN FRANCISCO, Calif., Nov. 06, 2025 (GLOBE NEWSWIRE) -- Pliant Therapeutics, Inc. (Nasdaq: PLRX), a clinical-stage biotechnology company focused on the discovery and development of integrin-based therapeutics, today provided a corporate update and reported third quarter 2025 financial results. “During the third quarter, our team continued to advance our portfolio while winding down activities surrounding the BEACON-IPF trial,” said Bernard Coulie, M.D., Ph.D., President and Chief Executive Officer of Pliant. “Looking ahead, we continue to evaluate a range of opportunities to create shareholder value.” Third Quarter and Recent Developments Oncology Program Phase 1 open-label trial of PLN-101095 in solid tumors has completed enrollment. PLN-101095 is an oral, small molecule, dual selective inhibitor of αvβ8 and αvβ1 integrins designed to overcome checkpoint resistance by blocking TGF-β activation in the tumor microenvironment. The Phase 1 open-label, dose-escalation trial of PLN-101095 as monotherapy and in combination with pembrolizumab is in patients with solid tumors that are resistant to immune checkpoint inhibitors. In March of 2025 we announced interim data from this trial showing PLN-101095 was well tolerated and displayed an objective response rate of 50% in the third of five ascending dose cohorts. The trial has now completed enrollment of all five dose cohorts. Data from the trial, including the two highest dose cohorts, is expected by the end of 2025. Bexotegrast BEACON-IPF close out activities to be completed in fourth quarter. Close out activities from the BEACON-IPF Phase 2b/3 clinical trial are expected to be completed in the fourth quarter of 2025 with full results from the trial to be submitted for future publication. Corporate Highlights In October, the Company announced that it completed a voluntary prepayment of all outstanding principal, accrued and unpaid interest, fees, costs and expenses under the March 11, 2024 Loan Agreement with Oxford Finance LLC. Third Quarter 2025 Financial Results Research and development expenses were $17.9 million as compared to $47.8 million for the prior-year quarter. The decrease was primarily driven by the discontinuation of BEACON-IPF. General and administrative expenses were $10.3 million as compared to $14.3 million for the prior-year quarter. The decrease was primarily due to lower personnel-related costs resulting from the strategic restructuring of our workforce. Net loss was $26.3 million as compared to $57.8 million for the prior-year quarter. The decrease was primarily attributable to the discontinuation of BEACON-IPF coupled with the decrease in personnel-related costs resulting from the strategic restructuring of our workforce. As of September 30, 2025, the Company had cash, cash equivalents and short-term investments of $243.3 million. About Pliant Therapeutics, Inc. Pliant Therapeutics is a clinical-stage biopharmaceutical company focused on the discovery and development of integrin-based therapeutics. The Company’s lead program is PLN-101095, a small molecule, dual-selective inhibitor of αvß8 and αvß1 integrins, that is being developed for the treatment of solid tumors. In addition, Pliant has received regulatory clearance for the conduct of a Phase 1 study of PLN-101325, a monoclonal antibody agonist of integrin α7β1 targeting muscular dystrophies. Pliant’s early-stage platform includes preclinical research focused on tissue-specific delivery and internalization of drug payloads utilizing integrin receptor-binding molecules. For additional information, please visit: www.PliantRx.com. Follow us on social media X, LinkedIn and Facebook. 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. Words such as "may," "will," "expect," "anticipate," "estimate," "intend," and similar expressions (as well as other words or expressions referencing future events, conditions, or circumstances) are intended to identify forward-looking statements. These statements include those regarding the close-out of the BEACON-IPF study, the anticipated timing of data from our ongoing Phase 1 trial of PLN-101095, the cost savings expected to result from our strategic restructuring, our ongoing evaluation of business opportunities and our ability to maintain core capabilities in support of Pliant’s next steps. Because such statements deal with future events and are based on our current expectations, they are subject to various risks and uncertainties and actual results, performance or achievements of Pliant could differ materially from those described in or implied by the statements in this press release. These forward-looking statements are subject to risks and uncertainties, including those related to the development and commercialization of our product candidates, including any delays in our ongoing or planned preclinical or clinical trials, the impact of current macroeconomic, geopolitical and marketplace conditions on our business, operations, clinical supply and plans, our reliance on single-source third parties located in foreign jurisdictions, including China, for critical aspects of our development operations, the risks inherent in the drug development process, the risks regarding the accuracy of our estimates of expenses and timing of development, our capital requirements and the need for additional financing, and our ability to obtain and maintain intellectual property protection for our product candidates. These and additional risks are discussed in the sections titled "Risk Factors" and "Management's Discussion and Analysis of Financial Condition and Results of Operations" in our Quarterly Report on Form 10-Q for the period ended September 30, 2025 which we are filing with the SEC today, available on the SEC's website at www.sec.gov. Unless otherwise noted, Pliant is providing this information as of the date of this news release and does not undertake any obligation to update any forward-looking statements contained in this document as a result of new information, future events or otherwise. Investor and Media Contact: Christopher Keenan Vice President, Investor Relations and Corporate Communications Pliant Therapeutics, Inc. [email protected]

BEACON-IPF close out activities continue Previously announced workforce and operational realignment largely complete Phase 1 oncology trial on track to deliver additional data by the end of the year SOUTH SAN FRANCISCO, Calif., Aug. 07, 2025 (GLOBE NEWSWIRE) -- Pliant Therapeutics, Inc. (Nasdaq: PLRX), a clinical-stage biotechnology company and leader in integrin-based drug development, today provided a corporate update and reported second quarter 2025 financial results. “While our activities in the quarter focused on the closure of BEACON-IPF and workforce realignment, we also took actions to ensure that we maintain core capabilities in support of Pliant’s next steps,” said Bernard Coulie, M.D., Ph.D., President and Chief Executive Officer of Pliant. “At the center is a deeply experienced late-stage clinical and regulatory development organization positioned to execute advanced trials. We remain committed to delivering shareholder value and look forward to providing updates in the future.” Second Quarter and Recent Developments Bexotegrast Bexotegrast development in idiopathic pulmonary fibrosis (IPF) discontinued. Following an analysis of the full safety and efficacy data from the BEACON-IPF Phase 2b/3 clinical trial, the Company has discontinued development of bexotegrast in idiopathic pulmonary fibrosis (IPF). While bexotegrast-treated patients demonstrated early signs of efficacy, the drug was shown to have an unfavorable risk-benefit profile based on IPF-related adverse events. Full results from BEACON-IPF will be submitted for future publication. Oncology Program Phase 1 trial of PLN-101095 in solid tumors continues to enroll. PLN-101095 is an oral, small molecule, dual selective inhibitor of αvβ8 and αvβ1 integrins designed to block TGF-β activation in the tumor microenvironment. The Phase 1 open-label, dose-escalation trial of PLN-101095 trial as monotherapy and in combination with pembrolizumab is in patients with solid tumors that are resistant to immune checkpoint inhibitors. The trial is currently dosing the fifth of five planned dose cohorts, evaluating PLN-101095 at 2000 mg administered twice daily (BID). Initial data from the two highest dose cohorts of the trial is expected by the end of 2025. Corporate Highlights In May, the Company announced a strategic restructuring of its workforce and other cost-saving measures intended to extend its cash runway. By the end of the second quarter, the restructuring was largely complete. Second Quarter 2025 Financial Results Research and development expenses were $32.2 million as compared to $45.6 million for the prior-year quarter. The decrease was primarily driven by the discontinuation of BEACON-IPF. General and administrative expenses were $13.4 million as compared to $15.0 million for the prior-year quarter. The decrease was primarily due to personnel-related costs resulting from the strategic restructuring of our workforce. Net loss was $43.3 million as compared to $55.9 million for the prior-year quarter. The decrease was primarily attributable to the discontinuation of BEACON-IPF coupled with the decrease in personnel-related costs resulting from the strategic restructuring of our workforce. As of June 30, 2025, the Company had cash, cash equivalents and short-term investments of $264.4 million. About Pliant Therapeutics, Inc. Pliant Therapeutics is a clinical-stage biopharmaceutical company and leader in the discovery and development of integrin-based therapeutics. Pliant is conducting a Phase 1 study for PLN-101095, a small molecule, dual-selective inhibitor of αvß8 and αvß1 integrins, that is being developed for the treatment of solid tumors. In addition, Pliant has received regulatory clearance for the conduct of a Phase 1 study of PLN-101325, a monoclonal antibody agonist of integrin α7β1 targeting muscular dystrophies. Pliant’s early-stage platform includes preclinical research focused on tissue-specific delivery and internalization of drug payloads utilizing integrin receptor-binding molecules. For additional information, please visit: www.PliantRx.com. Follow us on social media X, LinkedIn and Facebook. 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. Words such as "may," "will," "expect," "anticipate," "estimate," "intend," and similar expressions (as well as other words or expressions referencing future events, conditions, or circumstances) are intended to identify forward-looking statements. These statements include those regarding the close-out of the BEACON-IPF study, the anticipated timing of data from our ongoing Phase 1 trial of PLN-101095, the cost savings expected to result from our strategic restructuring and our ability to maintain core capabilities in support of Pliant’s next steps. Because such statements deal with future events and are based on our current expectations, they are subject to various risks and uncertainties and actual results, performance or achievements of Pliant Therapeutics could differ materially from those described in or implied by the statements in this press release. These forward-looking statements are subject to risks and uncertainties, including those related to the development and commercialization of our product candidates, including any delays in our ongoing or planned preclinical or clinical trials, the impact of current macroeconomic, geopolitical and marketplace conditions on our business, operations, clinical supply and plans, our reliance on single-source third parties located in foreign jurisdictions, including China, for critical aspects of our development operations, the risks inherent in the drug development process, the risks regarding the accuracy of our estimates of expenses and timing of development, our capital requirements and the need for additional financing, including the availability of additional term loans under our loan facility, and our ability to obtain and maintain intellectual property protection for our product candidates. These and additional risks are discussed in the sections titled "Risk Factors" and "Management's Discussion and Analysis of Financial Condition and Results of Operations" in our Quarterly Report on Form 10-Q for the period ended June 30, 2025 which we are filing with the SEC today, available on the SEC's website at www.sec.gov. Unless otherwise noted, Pliant is providing this information as of the date of this news release and does not undertake any obligation to update any forward-looking statements contained in this document as a result of new information, future events or otherwise. Investor and Media Contact: Christopher Keenan Vice President, Investor Relations and Corporate Communications Pliant Therapeutics, Inc. [email protected]

Pliant Therapeutics has discontinued the bexotegrast development for idiopathic pulmonary fibrosis (IPF) following a review of data from the terminated global, double-blind, randomised, placebo-controlled BEACON-IPF Phase IIb/III trial. The decision was influenced by the trial's full efficacy and safety data analysis involving 160mg and 320mg doses of the therapy, which indicated an unfavourable risk-benefit profile. In March 2025, the company announced the voluntary discontinuation of the BEACON-IPF based on recommendations and prespecified data review by the independent Data Safety Monitoring Board (DSMB) and an external expert panel, which noted an imbalance in IPF-related adverse events among participants. The therapy led to an increased risk of adverse events related to the progression of IPF disease against placebo. These included worsening of IPF, acute exacerbation, all-cause death, and respiratory-related hospitalisation. Subjects treated by the therapy had an average time to disease progression of 33 weeks. However, at week 12, the 160mg and 320mg therapy groups showed improvements in forced vital capacity (FVC) decline of 72mL and 46mL, respectively against placebo. At week 24, the improvements in FVC decline were observed as 58mL and 8mL for 160mg and 320mg groups, respectively. Pliant plans to submit the full outcomes from the BEACON-IPF trial for future publication. Pliant Therapeutics CEO and president Bernard Coulie said: "Although the decision to discontinue bexotegrast in IPF is disappointing for us and the many patients in need of new treatment options, we believe it is the right decision to protect patient safety. “We sincerely thank all patients, their caregivers, the study investigators and their research teams who were part of the BEACON-IPF clinical programme for their extensive efforts.” Meanwhile, the company continues to advance a Phase I open-label trial assessing PLN-101095, an oral small molecule inhibitor, as a single agent in solid tumours resistant to immune checkpoint inhibitors. The company’s early-stage platform encompasses preclinical research on tissue-specific delivery and internalisation of drug payloads leveraging integrin receptor-binding molecules. "Pliant halts bexotegrast development for IPF after trial results" was originally created and published by Clinical Trials Arena, a GlobalData owned brand. The information on this site has been included in good faith for general informational purposes only. It is not intended to amount to advice on which you should rely, and we give no representation, warranty or guarantee, whether express or implied as to its accuracy or completeness. You must obtain professional or specialist advice before taking, or refraining from, any action on the basis of the content on our site.

Activities supporting the close out of BEACON-IPF continue; topline data expected in the second quarter of 2025 Recently announced strategic realignment of workforce and operations will extend cash runway to support execution of late-stage clinical trials SOUTH SAN FRANCISCO, Calif., May 08, 2025 (GLOBE NEWSWIRE) -- Pliant Therapeutics, Inc. (Nasdaq: PLRX), a clinical-stage biotechnology company and leader in the discovery and development of novel therapeutics for the treatment of fibrotic diseases, today provided a corporate update and reported first quarter 2025 financial results. “During the first quarter and over recent weeks, our teams have been working diligently to close out the global BEACON-IPF trial with the goal of announcing topline data in the second quarter,” said Bernard Coulie, M.D., Ph.D., President and Chief Executive Officer of Pliant. “Additionally, progress was made in our oncology program with initial data from our Phase 1 dose escalation trial of PLN-101095 demonstrating antitumor activity, including confirmed partial responses, in a variety of solid tumors.” First Quarter and Recent Developments Bexotegrast Highlights BEACON-IPF close-out activities continue with topline data expected in the second quarter of 2025. Following the termination of the BEACON-IPF Phase 2b/3 trial evaluating bexotegrast in patients with idiopathic pulmonary fibrosis (IPF), the Company continues the formal close out of the global trial. Topline data from the BEACON-IPF trial is expected in the second quarter of 2025. Results from a Phase 2a positron emission tomography (PET) imaging trial published in the American Journal of Respiratory and Critical Care Medicine (AJRCCM). The publication reviews the previously reported positive results from the first interventional, single-center double-blind, placebo-controlled Phase 2 trial of bexotegrast using PET and magnetic resonance imaging to evaluate collagen deposition in the lungs of 10 patients with IPF. Oncology Program Interim Phase 1 data from a trial of PLN-101095 and pembrolizumab demonstrated antitumor activity with confirmed partial responses in three of six patients treated with the highest dose tested to date. Topline data from the first three cohorts of the ongoing Phase 1 dose escalation trial of PLN-101095 in combination with pembrolizumab showed confirmed partial responses in solid tumors that are resistant to immune checkpoint inhibitors. Of the six patients treated at the 1000 mg dose administered orally twice daily (BID), three patients, suffering from non-small cell lung cancer (NSCLC), cholangiocarcinoma and melanoma, experienced confirmed partial response assessed by iRECIST criteria associated with 74%, 48% and 42% reductions in tumor size, respectively. PLN-101095 was generally well tolerated across all doses tested. The trial is currently enrolling the fourth of five potential cohorts, evaluating PLN-101095 at 1000 mg administered three times daily (TID). Corporate Highlights Strategic realignment of workforce and operations underway. On May 1, 2025, the Company announced a strategic realignment of its operations including an approximately 45% reduction in its workforce as well as other cost-saving actions. The process is expected to extend the cash runway to support execution of clinical trials, including any late-stage clinical trials, and is expected to be substantially completed by the second quarter of 2025. First Quarter 2025 Financial Results Research and development expenses were $43.4 million, as compared to $37.1 million for the prior-year quarter. The increase was primarily due to acceleration of close-out activities for BEACON-IPF, a Phase 2b/3 study of bexotegrast and employee-related expenses, driven by increased headcount. General and administrative expenses were $15.5 million, as compared to $15.2 million for the prior-year quarter. The increase was primarily due to professional service expenses. Net loss of $56.2 million as compared to $47.0 million for the prior-year quarter. The increase was primarily due to higher operating expenses driven by close-out activities related to BEACON-IPF. As of March 31, 2025, the Company had cash, cash equivalents and short-term investments of $307.1 million. About Pliant Therapeutics, Inc. Pliant Therapeutics is a clincial-stage biopharmaceutical company and leader in the discovery and development of novel therapeutics for the treatment of fibrotic diseases. Pliant's lead product candidate, bexotegrast (PLN-74809), is an oral, small molecule, dual selective inhibitor of αvß6 and αvß1 integrins that is in development in the lead indication for the treatment of idiopathic pulmonary fibrosis, or IPF. Bexotegrast has received Fast Track Designation and Orphan Drug Designation from the U.S. Food and Drug Administration (FDA) and Orphan Drug Designation from the European Medicines Agency in IPF. Pliant is conducting a Phase 1 study for PLN-101095, a small molecule, dual-selective inhibitor of αvß8 and αvß1 integrins, that is being developed for the treatment of solid tumors resistant to immune checkpoint inhibitors. In addition, Pliant has received regulatory clearance for the conduct of a Phase 1 study of PLN-101325, a monoclonal antibody agonist of integrin α7β1 targeting muscular dystrophies. For additional information, please visit: www.PliantRx.com. Follow us on social media X, LinkedIn and Facebook. 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. Words such as "may," "will," "expect," "anticipate," "estimate," "intend," and similar expressions (as well as other words or expressions referencing future events, conditions, or circumstances) are intended to identify forward-looking statements. These statements include those regarding the anticipated timing of data and progress from the close-out of the BEACON-IPF study and development plans for PLN-101095. Because such statements deal with future events and are based on our current expectations, they are subject to various risks and uncertainties and actual results, performance or achievements of Pliant Therapeutics could differ materially from those described in or implied by the statements in this press release. These forward-looking statements are subject to risks and uncertainties, including those related to the development and commercialization of our product candidates, including any delays in our ongoing or planned preclinical or clinical trials, the impact of current macroeconomic, geopolitical and marketplace conditions on our business, operations, clinical supply and plans, our reliance on single-source third parties located in foreign jurisdictions, including China, for critical aspects of our development operations, the risks inherent in the drug development process, the risks regarding the accuracy of our estimates of expenses and timing of development, our capital requirements and the need for additional financing, including the availability of additional term loans under our loan facility, and our ability to obtain and maintain intellectual property protection for our product candidates. These and additional risks are discussed in the sections titled "Risk Factors" and "Management's Discussion and Analysis of Financial Condition and Results of Operations" in our Quarterly Report on Form 10-Q for the period ended March 31, 2025 which we are filing with the SEC today, available on the SEC's website at www.sec.gov. Unless otherwise noted, Pliant is providing this information as of the date of this news release and does not undertake any obligation to update any forward-looking statements contained in this document as a result of new information, future events or otherwise. Investor and Media Contact: Christopher Keenan Vice President, Investor Relations and Corporate Communications Pliant Therapeutics, Inc. [email protected]