\nImmunome, Inc. (Nasdaq: IMNM), a biotechnology company committed to developing first-in-class and best-in-class targeted cancer therapies, today announced positive topline results from the global pivotal Phase 3 RINGSIDE trial of varegacestat, an investigational, oral, once-daily gamma secretase inhibitor (GSI), in patients with progressing desmoid tumors.\n<\/p>\n
\nThe trial met its primary endpoint of improving progression-free survival, demonstrating a statistically significant and clinically meaningful improvement vs. placebo, with an 84% reduction in the risk of disease progression or death (hazard ratio (HR) = 0.16, 95% CI: 0.071, 0.375; p<0.0001). The confirmed objective response rate (ORR) based on RECIST v1.1 was 56% with varegacestat vs. 9% with placebo (p<0.0001), as assessed by blinded independent central review. In an exploratory analysis, varegacestat demonstrated a median best change in tumor volume of -83% vs. +11% with placebo, as assessed by blinded independent central review. In addition, the trial met all key secondary endpoints, with varegacestat achieving statistically significant improvements vs. placebo in landmark tumor volume reduction and worst pain intensity.\n<\/p>\n
\nVaregacestat was generally well tolerated, with a manageable safety profile consistent with the GSI class. The most common adverse events for participants in the treatment arm were diarrhea (82%), fatigue (44%), rash (43%), nausea (35%) and cough (34%). Most events were grade 1 or 2.\n<\/p>\n
\nBased on these data, Immunome plans to submit a New Drug Application to the U.S. Food and Drug Administration in Q2 2026.\n<\/p>\n
\n\u201cRINGSIDE is the largest and most comprehensive clinical trial conducted to date in patients with desmoid tumors, and the topline results represent the highest objective response rate observed in a randomized clinical trial in this patient population,\u201d said Immunome\u2019s CEO Clay Siegall, Ph.D. \u201cThese findings demonstrate the potential of varegacestat to offer best-in-class results in a convenient, once-daily, oral medicine that may help patients reclaim their lives.\u201d\n<\/p>\n
\n\u201cDesmoid tumors can have a devastating physical and emotional impact on patients given their unpredictable nature and the limitations of current treatment options,\u201d said Mrinal M. Gounder, M.D., sarcoma medical oncologist and drug development specialist at Memorial Sloan Kettering Cancer Center, and RINGSIDE primary investigator. \u201cThe progression-free survival benefit, high response rate and reduction in tumor volume with varegacestat in the RINGSIDE trial are striking. These findings elevate the role of GSIs and confirm varegacestat could become standard of care in the treatment of desmoid tumors.\u201d\n<\/p>\n
\nDr. Siegall added, \u201cThe RINGSIDE results represent a major milestone for Immunome as we advance our emerging pipeline of targeted oncology therapies that have exceptional potential to meaningfully improve the lives of patients.\u201d\n<\/p>\n
\nImmunome plans to share additional data from the RINGSIDE trial at an upcoming major medical conference.\n<\/p>\n
Webcast, Presentation Slides and Conference Call Information<\/b><\/p>\n
\nImmunome will host a webcast and conference call on Monday, December 15, 2025, at 8:30 a.m. ET \/ 5:30 a.m. PT to discuss the Phase 3 RINGSIDE trial topline results. A live webcast, which will include presentation slides, can be accessed using this link<\/a> or by visiting the Events and Presentations section of the Immunome website at https:\/\/investors.immunome.com\/events<\/a>. The conference call can be accessed by clicking on the call link<\/a> and completing the online registration form, which will enable the selection of a dial-in number or callback from the system. A live question-and-answer session will follow the prepared remarks. Participants wishing to ask a question must do so via the conference call; the webcast will be listen-only. After the live webcast, the event will remain archived on the Immunome website for 90 days.\n<\/p>\n About the RINGSIDE Trial<\/b><\/p>\n \nThe global, randomized, double-blind, placebo-controlled Phase 3 RINGSIDE trial (NCT04871282<\/a>) evaluated the efficacy and safety of varegacestat in patients with progressing desmoid tumors. A total of 156 patients were randomized to receive varegacestat 1.2 mg daily or placebo until disease progression or death. The primary endpoint of the trial was progression-free survival as assessed by blinded independent central review. Statistically controlled secondary endpoints were ORR using RECIST v1.1 and change in tumor volume at week 24, both determined by blinded independent central review, as well as change in pain intensity as determined using a patient reported outcome instrument. Additional secondary endpoints included duration of response, best reduction in tumor volume, patient-reported outcomes, and safety and tolerability. RINGSIDE includes an open-label extension phase, which is ongoing.\n<\/p>\n About Desmoid Tumors<\/b><\/p>\n \nDesmoid tumors (also known as aggressive fibromatosis or desmoid-type fibromatosis) are aggressive non-metastatic soft tissue tumors that are prone to recurrence. Approximately 1,000-1,650 people are diagnosed with desmoid tumors each year in the United States, and there are approximately 10,000-11,000 actively managed patients. Those affected face debilitating pain, deformity and, in some cases, life-threatening organ damage. The chronic pain and physical limitations associated with desmoid tumors lead to a high clinical burden and impaired quality of life. Although desmoid tumors are not considered cancerous, they often require systemic treatment to prevent permanent disability and alleviate disease burden.\n<\/p>\n About Varegacestat<\/b><\/p>\n \nVaregacestat (formerly AL102) is an investigational, oral, once-daily gamma secretase inhibitor. In December 2025, Immunome reported positive topline results for the Phase 3 RINGSIDE trial of varegacestat in adults with progressing desmoid tumors. Immunome plans to submit a New Drug Application for varegacestat to the U.S. Food and Drug Administration in Q2 2026.\n<\/p>\n About Immunome, Inc.<\/b><\/p>\n \nImmunome is a clinical-stage targeted oncology company committed to developing first-in-class and best-in-class targeted cancer therapies. We are advancing an innovative portfolio of therapeutics, drawing on leadership that previously played key roles in the design, development, and commercialization of cutting-edge therapies, including antibody-drug conjugate therapies. Our pipeline includes varegacestat, a late-clinical stage GSI; IM-1021, a clinical-stage ROR1 ADC; and IM-3050, a FAP-targeted radiotherapy that recently received IND clearance. We are also advancing a broad portfolio of early stage ADCs pursuing undisclosed solid tumor targets. For more information, visit www.immunome.com<\/a>.\n<\/p>\n Financial Disclosure<\/b><\/p>\n \nDr. Gounder has financial interests related to Immunome.\n<\/p>\n Cautionary Statement Regarding Forward-Looking Statements<\/b><\/p>\n \nStatements in this press release that are not purely historical in nature are \u201cforward-looking statements\u201d within the meaning of the Private Securities Litigation Reform Act of 1995. We use words such as \u201cfocused,\u201d \u201cadvance,\u201d \u201canticipate,\u201d \u201cif warranted,\u201d \u201cpotential,\u201d \u201cplan,\u201d \u201cexpect,\u201d and similar expressions to identify these forward-looking statements. These forward-looking statements include statements regarding: the best in class potential of varegacestat and its potential to help patients reclaim their lives; Immunome\u2019s expected timing for submitting an NDA for varegacestat with the U.S. Food and Drug Administration; the potential for varegacestat to become the new standard of care; Immunome\u2019s plans to provide additional data from the RINGSIDE trial; the potential of Immunome\u2019s targeted oncology therapies to be first-in-class or best-in-class status and deliver therapeutic breakthroughs to patients; and other statements regarding management\u2019s intentions, plans, beliefs, expectations or forecasts for the future. These forward-looking statements are based on Immunome\u2019s current expectations and involve assumptions that may never materialize or may prove to be incorrect; consequently, actual results may differ materially from those expressed or implied in the statements due to a number of factors, including the RINGSIDE topline results are based on a preliminary analysis of key efficacy and safety data, and such data may change following a more comprehensive review of the data and such topline data may not accurately reflect the complete results of the trial; the risk that our NDA submission for varegacestat is delayed based on regulatory feedback or otherwise, and that regulatory approvals for Immunome\u2019s programs and product candidates are not obtained, are delayed or are subject to unanticipated conditions, including the risk that the results of our trials for varegacestat may not be deemed sufficient by the FDA to serve as the basis for an NDA submission or regulatory approval of varegacestat; the risks associated with the potential safety and other complications from varegacestat; the labelling for varegacestat, if approved; the scope, progress and expansion of developing and commercializing varegacestat, if approved; the size and growth of the market for varegacestat and the rate and degree of its market acceptance; the risk that Immunome will not be able to realize the benefits of its strategic transactions; uncertainties related to Immunome\u2019s capital requirements and Immunome\u2019s expected cash runway; Immunome\u2019s ability to grow and advance its pipeline and successfully execute on its business plan; and other risks and uncertainties included under the caption \u201cRisk Factors\u201d in Immunome\u2019s Quarterly Report on Form 10-Q for the quarter ended September 30, 2025, filed with the Securities and Exchange Commission on November 6, 2025. These documents can also be accessed on Immunome\u2019s website at www.immunome.com<\/a> by clicking on the link \u201cFinancials\u201d under the \u201cInvestors\u201d tab. The forward-looking statements included in this press release are made only as of the date hereof. Except as required by law, Immunome assumes no obligation and does not intend to update any forward-looking statements included in this press release.\n<\/p>\n View source version on businesswire.com: <\/span>https:\/\/www.businesswire.com\/news\/home\/20251215845554\/en\/<\/a><\/span><\/p>\n Investor Contact: Media Contact: KEYWORDS:<\/b> Washington United States North America<\/p>\n INDUSTRY KEYWORDS:<\/b> Biotechnology Health Pharmaceutical Clinical Trials Oncology<\/p>\n<\/p>\n
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<\/b>Max Rosett
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Chief Financial Officer, Immunome
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investors@immunome.com<\/a><\/p>\n
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Nicole Foderaro
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Real Chemistry
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media@immunome.com<\/a><\/p>\n
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