Ripretinib

PLYMOUTH, Mass.--( BUSINESS WIRE )--IDRx, Inc., a clinical-stage biopharmaceutical company dedicated to developing and commercializing precision therapeutics for the treatment of cancers with well-characterized biology and significant unmet medical need, today announced updated clinical data from StrateGIST 1, the company’s ongoing Phase 1/1b trial of IDRX-42 in patients with advanced gastrointestinal stromal tumors (GIST). These data continue to demonstrate promising anti-tumor activity of IDRX-42 in patients with advanced GIST and will be highlighted today in an oral presentation at the Connective Tissue Oncology Society (CTOS) 2024 Annual Meeting, being held November 13-16, in San Diego, CA. IDRX-42 is an investigational oral, small molecule, tyrosine kinase inhibitor (TKI) designed to selectively target the most prevalent KIT mutations that either drive the growth, proliferation, and survival of tumor cells (activating mutations in exons 9 and 11), or confer resistance to currently available therapies (resistance mutations in exons 13 and 17). “ In patients living with GIST, the therapeutic potential of KIT targeted TKIs has been limited by drug resistance caused by an inability to target the spectrum of the most prevalent KIT mutations, and poor tolerability,” said Suzanne George, M.D., Chief, Division of Sarcoma at the Dana-Farber Cancer Institute. “ These updated data from StrateGIST 1 are highly encouraging with respect to the clinical activity observed in later-line patients with a variety of KIT activating and resistance mutations. I am excited by the potential of IDRX-42, with its differentiated clinical profile demonstrated to date, to help meet this critical need for GIST patients.” “ We are particularly excited about the emerging durability data from StrateGIST 1. These data, together with the continued strengthening of response rate and tolerability data, underscore the potential for IDRX-42 to improve outcomes for GIST patients and support our plans to move IDRX-42 into late-phase development,” said Tim Clackson, Ph.D., Chief Executive Officer of IDRx. “ With FDA alignment now in place, we plan to conduct StrateGIST 3, a randomized, Phase 3 registrational trial which will evaluate the efficacy and safety of IDRX-42 as compared to sunitinib in second-line GIST patients. We remain steadfast in our commitment to transform the lives of patients with GIST, including in early-line settings, where the standards of care have remained unchanged for almost 20 years and a significant unmet need remains.” Presentation Highlights As of the data cut-off date of September 30, 2024, 89 patients have been treated with IDRX-42 in the Phase 1 portion of the ongoing StrateGIST 1 trial across dose cohorts ranging from 120 mg once daily (QD) to 1200 mg total daily dose (600 mg twice daily (BID)). All 89 patients had KIT -mutant GIST. 87 patients were evaluable for efficacy as of the data cut-off date. The two non-evaluable patients were recently enrolled and remain on treatment, awaiting their first post-baseline tumor assessment. While a maximum tolerated dose was not reached, dose escalation in the Phase 1 portion of the trial has been completed, and the Phase 1b dose confirmation portion of the trial has been initiated utilizing a dose of 300 mg in tablet formulation, which has comparable steady-state plasma exposure to a dose of 400 mg in capsule formulation. Patients were heavily pretreated overall, with a median of four prior lines of therapy. 17% (15/89) patients had received one prior line of therapy (IDRX-42 evaluated as second-line). 11% (10/89) patients had received two prior lines of therapy (IDRX-42 evaluated as third-line). 72% (64/89) patients had received three or more prior lines of therapy (IDRX-42 evaluated as ≥ fourth-line). 28% (25/89) received three or more prior lines of therapy that did not include ripretinib. As of the data cut-off date, 63% (56/89) of patients remained on study treatment, and the median duration of treatment was 6.6 months. The ORR by modified RECIST v1.1 in the total efficacy evaluable population was 29% (25/87) treated across all lines of therapy, including one complete response (CR) and 24 partial responses (PRs). Two of the PRs were awaiting confirmation at the time of the data cut. At the 400 mg capsule/300 mg tablet QD recommended Phase 1b dose (RP1bD), the ORR was 26% (10/38) in the total efficacy evaluable population. The ORR in second-line patients was 53% (8/15) including one CR and 7 PRs. At the RP1bD or below, the ORR was 50% (7/14) across second-line patients. In second-line patients (n=15), the 6-month PFS was 85%, and the median was not yet reached. The median PFS in third- or later-line patients both at the RP1bD (n=25) and across all doses (n=72) was 9.2 months. The median PFS in third-line patients overall (n=10) was 12.9 months. The median PFS in fourth- or later-line patients who had not previously received ripretinib (n=25) was 9.2 months, and at the RP1bD (n=10) was 11 months. IDRX-42 was generally well-tolerated and treatment-related adverse events (TRAEs) were mainly low grade at the RP1bD. The most frequently reported TRAEs (≥20%) were gastrointestinal symptoms (diarrhea, nausea, decreased appetite, vomiting, dysgeusia) and fatigue. An 8% dose reduction rate due to TRAEs was observed at RP1bD, with no TRAEs leading to dose discontinuation. The Phase 1b portion of StrateGIST 1 commenced enrollment in May 2024 and includes a first-, second-, and two later-line cohorts. The second- and two later-line cohorts are nearly fully enrolled. IDRx has aligned with the FDA on fundamental elements of the trial design, dose, and statistical analysis for StrateGIST 3, a global, randomized, Phase 3 registrational trial which will evaluate IDRX-42 as a second-line therapy in patients diagnosed with metastatic and/or unresectable GIST with disease progression on, or intolerance to, imatinib, the current first-line standard of care for GIST patients. Presentation Details Title: The Novel KIT inhibitor IDRX-42 Shows Promising Activity in Second- and Later-Line Gastrointestinal Stromal Tumors (GIST): Results from a Phase 1 Trial (StrateGIST 1) Presenter: Suzanne George, M.D. Abstract Number: P 10 Presentation Type: Oral Abstract Session Time: Thursday, November 14, 10:30 a.m. – 11:30 a.m. PST Location: Harbor Ballroom, Manchester Grand Hyatt, San Diego, CA About GIST Gastrointestinal stromal tumor (GIST) is the most common subtype of soft tissue sarcoma occurring in the gastrointestinal tract. Between 4,000 to 6,000 people are diagnosed with GIST in the United States each year. Approximately 80% of all GIST cases are driven by mutations in the KIT gene. An estimated 90% of patients who receive imatinib, the current standard of care for GIST, will experience disease progression related to the emergence of KIT resistance mutations. In unresectable or metastatic GIST, clinical benefits from existing treatments can vary by mutation type. Despite the widespread availability of tyrosine kinase inhibitors approved for GIST, first-line and second-line standards of care have remained unchanged for almost 20 years and significant unmet need remains. About the StrateGIST 1 Study StrateGIST 1 is an ongoing, open-label, first-in-human Phase 1/1b study designed to evaluate the safety, tolerability, pharmacokinetics, and preliminary anti-tumor activity of IDRX-42 in patients with metastatic and/or surgically unresectable GIST after progression on imatinib and other approved drugs. The study is currently enrolling patients with documented pathogenic mutation in KIT or any platelet-derived growth factor receptor alpha (PDGFRA) mutation (other than PDGFRA exon 18) at sites in the U.S., United Kingdom, Belgium, the Netherlands, France, Germany, Italy, Spain, South Korea, and China. The Phase 1b portion commenced enrollment in May 2024 and includes four exploratory cohorts based on defined lines of prior tyrosine kinase inhibitor therapy, including first-, second-, third- and later-line therapies. About IDRX-42 IDRX-42 is an investigational oral, small molecule KIT tyrosine kinase inhibitor in clinical development as a monotherapy for the treatment of gastrointestinal stromal tumors (GIST). IDRX-42 is designed to selectively target the most prevalent forms of KIT mutations that either drive the initial growth, proliferation, and survival of tumor cells, or confer resistance to currently available therapies. In pre-clinical studies, IDRX-42 demonstrated superior anti-tumor activity as compared to imatinib, the current first-line of therapy, in tumors associated with both exon 9 and 11 KIT mutations. IDRX-42 was also shown in pre-clinical studies to have strong inhibition activity against the most prevalent KIT resistance mutations in exons 13 and 17, suggesting that IDRX-42 could prevent or substantially delay the emergence of such mutations. In xenograft models expressing secondary resistance mutations in KIT exon 13 or 17, IDRX-42 treatment resulted in potent and dose-dependent antitumor activity superior to the second-line standard of care agent, sunitinib. IDRX-42 is currently being evaluated in StrateGIST 1, a first-in-human Phase 1/1b trial. IDRX-42 has been granted Fast Track and Orphan Drug designations by the U.S. Food and Drug Administration for the treatment of GIST after disease progression on imatinib. About IDRx IDRx is a clinical-stage biopharmaceutical company dedicated to developing and commercializing precision therapeutics for the treatment of cancers with well-characterized biology and significant unmet medical need. IDRx aims to address the limitations of today’s precision cancer medicines with highly potent and selective targeted therapies to stop key tumor escape mechanisms and prolong patients’ response to therapy. IDRx’s lead program is IDRX-42, which is designed to selectively target the most prevalent forms of KIT mutations and has the potential to improve outcomes for gastrointestinal stromal tumor (GIST) patients as a first- or second-line therapy, where the standards of care have remained unchanged for almost 20 years and significant unmet need remains. Founded in 2021, IDRx’s leadership team has extensive experience in drug development and collectively has been involved in the discovery, development, and commercialization of more than 10 approved medicines. To learn more, please visit www.idrx.com and follow us on LinkedIn .

– MOTION Phase 3 Data Demonstrate Robust Efficacy, Clinically Meaningful Improvements in Quality-of-Life Measures, and Well-Tolerated Safety Profile, Positioning Vimseltinib as Potential New TGCT Treatment – – Company Expects to Submit a New Drug Application (NDA) in the Second Quarter of 2024 and Marketing Authorisation Application (MAA) in the Third Quarter of 2024 – WALTHAM, Mass.--(BUSINESS WIRE)-- Deciphera Pharmaceuticals LLC, (NASDAQ: DCPH), a biopharmaceutical company focused on discovering, developing, and commercializing important new medicines to improve the lives of people with cancer, today announced that results from the Company’s MOTION pivotal Phase 3 study of vimseltinib in patients with TGCT are being highlighted in an oral presentation at the 2024 American Society of Clinical Oncology (ASCO) Annual Meeting, being held in Chicago, Illinois, and have been published in The Lancet. The article titled “Vimseltinib versus placebo for tenosynovial giant cell tumour (MOTION): a randomised phase 3 trial” is now available online and will be published in a future print issue of The Lancet. “The results from the MOTION pivotal Phase 3 study provide compelling evidence that vimseltinib can address the unmet medical need in TGCT for an effective and well-tolerated therapy without cholestatic hepatotoxicity,” said Hans Gelderblom, M.D., Ph.D., Chair of the Department of Medical Oncology at Leiden University Medical Center and senior author of the manuscript. “In addition to its robust antitumor activity and tolerability, vimseltinib also demonstrated clinically significant functional and symptomatic improvements in key quality-of-life measures, which can provide long-term, meaningful benefits to TGCT patients.” “Building upon the strong efficacy results disclosed previously at topline, we are excited to share details on the statistically significant and clinically meaningful improvements that vimseltinib offered TGCT patients across all six key secondary endpoints, along with its favorable safety profile,” said Matthew L. Sherman, M.D., Executive Vice President and Chief Medical Officer of Deciphera. “We remain on track to submit an NDA for vimseltinib in the second quarter of 2024, and an MAA in the third quarter of 2024, and look forward to bringing this important new therapy to TGCT patients globally.” In addition to the results from the MOTION pivotal Phase 3 study, the Company will also be presenting a trial-in-progress poster for the ongoing Phase 1/2 study of DCC-3116 in combination with ripretinib at the 2024 ASCO Annual Meeting. Both presentations are available on the Company’s website at . Presentation details are as follows: Abstract Number: 11500 Title: Efficacy, safety, and patient-reported outcomes of vimseltinib in patients with tenosynovial giant cell tumor: Results from the phase 3 MOTION trial. Presenter: William D. Tap, M.D., FASCO, Memorial Sloan Kettering Cancer Center Presentation Date: Monday, June 3, 2024 Presentation Time: 3:00 – 3:12 PM CT Key Highlights: Study Design: The MOTION pivotal Phase 3 study is a two-part, randomized, double-blind, placebo-controlled study to assess the efficacy and safety of vimseltinib in patients with TGCT not amenable to surgery with no prior anti-CSF1/CSF1R therapy (prior therapy with imatinib or nilotinib allowed). In Part 1, patients (n=123) were randomized two-to-one to receive either 30 mg twice weekly of vimseltinib (n=83) or placebo (n=40) for 24 weeks. The results for Part 1 of the study are based on a data cutoff date of August 22, 2023. The open-label Part 2 portion of MOTION, in which patients from both the vimseltinib and placebo arms receive treatment with vimseltinib, remains ongoing. ORR: The primary endpoint of the study is ORR at Week 25 as measured by Response Evaluation Criteria in Solid Tumors (RECIST) version 1.1 by blinded independent radiologic review (IRR). The study met its primary endpoint in the intent-to-treat (ITT) population demonstrating statistically significant and clinically meaningful improvement versus placebo in ORR at Week 25 based on IRR per RECIST v1.1. In the ITT population, the ORR at Week 25 was 40% (95% CI: 29%, 51%) for the vimseltinib arm and 0% (95% CI: 0%, 9%) for the placebo arm resulting in a response difference (vimseltinib versus placebo) of 40% (95% CI: 29%, 51%) (p<0.0001). Secondary Endpoints: In addition to meeting the primary endpoint, the study also achieved statistically significant and clinically meaningful improvements versus placebo in all six key secondary endpoints assessed at Week 25 including ORR by tumor volume score (TVS), active range of motion (ROM), physical function, stiffness, quality of life, and pain. ORR by TVS: The ORR at Week 25 based on IRR per TVS was 67% (95% CI: 56%, 77%) for the vimseltinib arm and 0% (95% CI: 0%, 9%) for the placebo arm (p<0.0001). Active ROM: Treatment with vimseltinib demonstrated an improvement in mean change from baseline in active ROM at Week 25 of 18.4% versus a 3.8% improvement for placebo (p=0.0077). Physical Function by PROMIS-PF: Treatment with vimseltinib demonstrated an improvement in mean change from baseline in PROMIS-PF at Week 25 of 4.6 versus 1.3 for placebo (p=0.0007). Worst Stiffness Numeric Rating Scale (NRS): Patients treated with vimseltinib reported a decrease of 2.1 versus 0.3 for placebo in worst stiffness (p<0.0001). Quality of Life by EuroQol Visual Analogue Scale (EQ-VAS): The mean change from baseline for EQ-VAS was significantly higher with 13.5 in the vimseltinib arm versus 6.1 in the placebo arm (p=0.016). Brief Pain Inventory (BPI) Worst Pain Response Rate: The BPI worst pain response rate was 48% for patients receiving vimseltinib versus 23% for placebo (p=0.0056). Safety and Tolerability: Vimseltinib was well tolerated with most treatment-emergent adverse events (TEAEs) were grade 1 or 2. There was no evidence of cholestatic hepatotoxicity, drug-induced liver injury, or hair hypopigmentation. Serum enzyme elevations were consistent with the known mechanism of action of CSF1R inhibitors. TEAEs leading to treatment discontinuation was 6% in the vimseltinib arm. If approved, vimseltinib offers an effective systemic treatment to patients with TGCT and provides proven functional health and symptomatic benefit to a population living with substantial morbidity and limited treatment options. Abstract Number: TPS11587 Title: DCC-3116 in combination with ripretinib for patients with advanced gastrointestinal stromal tumor: A phase 1/2 study. Presenter: Sreenivasa Chandana, M.D., Ph.D., START Midwest, The Cancer & Hematology Centers Session Date: Saturday, June 1, 2024 Session Time: 1:30 – 4:30 PM CT Key Highlights: This is a phase 1/2, multicenter study designed to evaluate the safety, tolerability, and efficacy of DCC-3116 in combination with ripretinib. In Part 1, eligible patients will receive escalating oral doses of DCC-3116 combined with ripretinib 150 mg once daily (QD); the safety will be evaluated and the recommended phase 2 dose (RP2D) will be determined. In Part 2, eligible patients will receive the RP2D of DCC-3116 in combination with ripretinib 150 mg QD; antitumor activity will be evaluated. The trial is currently enrolling in the phase 1 dose escalation portion. About Deciphera Pharmaceuticals Deciphera is a biopharmaceutical company focused on discovering, developing, and commercializing important new medicines to improve the lives of people with cancer. We are leveraging our proprietary switch-control kinase inhibitor platform and deep expertise in kinase biology to develop a broad portfolio of innovative medicines. In addition to advancing multiple product candidates from our platform in clinical studies, QINLOCK® is Deciphera’s switch-control inhibitor for the treatment of fourth-line GIST. QINLOCK is approved in Australia, Canada, China, the European Union, Hong Kong, Iceland, Israel, Liechtenstein, Macau, New Zealand, Norway, Singapore, Switzerland, Taiwan, The United Kingdom, and the United States. For more information, visit and follow us on LinkedIn and X (@Deciphera). Cautionary Note Regarding Forward-Looking Statements This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995, as amended, including, without limitation, our expectations and timing regarding the potential for our preclinical and/or clinical stage pipeline assets to be first-in-class and/or best-in-class treatments, the timing of our NDA and MAA submissions for vimseltinib, and plans to present trial-in-progress poster for the ongoing Phase 1/2 study of DCC-3116 in combination with ripretinib at the 2024 ASCO Annual Meeting. The words “may,” “will,” “could,” “would,” “should,” “expect,” “plan,” “anticipate,” “intend,” “believe,” “estimate,” “predict,” “project,” “potential,” “continue,” “seek,” “target” and similar expressions are intended to identify forward-looking statements, although not all forward-looking statements contain these identifying words. Any forward-looking statements in this press release are based on management’s current expectations and beliefs and are subject to a number of risks, uncertainties and important factors that may cause actual events or results to differ materially from those expressed or implied by any forward-looking statements contained in this press release, including, without limitation: (i) risks associated with the timing of the closing of the proposed transaction, including the risks that a condition to closing would not be satisfied within the expected timeframe or at all or that the closing of the proposed transaction will not occur; (ii) uncertainties as to how many of Deciphera’s stockholders will tender their shares in the offer; (iii) the possibility that a governmental entity may prohibit, delay or refuse to grant approval for the consummation of the transaction; (iv) the possibility that competing offers will be made; (v) the outcome of any legal proceedings that may be instituted against the parties and others related to the merger agreement; (vi) unanticipated difficulties or expenditures relating to the proposed transaction, the response of business partners and competitors to the announcement of the proposed transaction, and/or potential difficulties in employee retention as a result of the announcement and pendency of the proposed transaction; (vii) Deciphera’s ability to successfully demonstrate the efficacy and safety of its drug or drug candidates, and the preclinical or clinical results for its product candidates, which may not support further development of such product candidates; (viii) comments, feedback and actions of regulatory agencies; (ix) Deciphera’s ability to commercialize QINLOCK® and execute on its marketing plans for any drugs or indications that may be approved in the future; (x) the inherent uncertainty in estimates of patient populations, competition from other products, Deciphera’s ability to obtain and maintain reimbursement for any approved product and the extent to which patient assistance programs are utilized; and (xi) other risks identified in our Securities and Exchange Commission (SEC) filings, including our Quarterly Report on Form 10-Q for the quarter ended March 31, 2024, and subsequent filings with the SEC. We caution you not to place undue reliance on any forward-looking statements, which speak only as of the date they are made. We disclaim any obligation to publicly update or revise any such statements to reflect any change in expectations or in events, conditions or circumstances on which any such statements may be based, or that may affect the likelihood that actual results will differ from those set forth in the forward-looking statements. The Deciphera logo and the QINLOCK® word mark and logo are registered trademarks and the Deciphera word mark is a trademark of Deciphera Pharmaceuticals, LLC.