On December 20, 2018 Deciphera Pharmaceuticals, Inc. (NASDAQ:DCPH), a clinical-stage biopharmaceutical company focused on addressing key mechanisms of tumor drug resistance, reported that it has initiated a pivotal Phase 3 clinical study, "INTRIGUE", to evaluate the efficacy and tolerability of ripretinib (DCC-2618), a broad-spectrum KIT and PDGFRα inhibitor, compared to sunitinib in second-line gastrointestinal stromal tumor (GIST) patients (Press release, Deciphera Pharmaceuticals, DEC 20, 2018, View Source [SID1234532194]).
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"We are extremely pleased that the INTRIGUE Phase 3 study of ripretinib is now open to enroll second-line GIST patients, regardless of their mutational status, who have progressed on, or are intolerant to front-line therapy with imatinib," said Michael D. Taylor, Ph.D., President and Chief Executive Officer of Deciphera. "If successful, we believe this Phase 3 study could serve as the basis for a regulatory submission for broad use in all second-line GIST patients."
"INTRIGUE is the second pivotal Phase 3 study of ripretinib that Deciphera has initiated in less than one year. As recently announced, we expect to report top-line data from our first Phase 3 clinical study, INVICTUS, in fourth-line and fourth-line-plus GIST patients in mid-2019," continued Dr. Taylor.
"While imatinib is an effective treatment for most patients with early-stage GIST, in almost all patients the disease will eventually progress due to the development of secondary drug resistance mutations," said Professor Michael Heinrich, MD, Cell and Developmental Biology, OHSU Knight Cancer Institute. "A well-tolerated therapy with broad coverage and efficacy across the spectrum of KIT and PDGFRα mutations would represent a much-needed improvement over currently approved therapies for patients with GIST."
About the INTRIGUE Phase 3 Study
The INTRIGUE Phase 3 clinical study is an interventional, randomized, global, multicenter, open-label study to evaluate the safety, tolerability and efficacy of ripretinib compared to sunitinib in patients with GIST previously treated with imatinib. This study was designed to support regulatory approvals in second-line GIST patients in the United States, Europe and other major markets. Patients will be randomized 1:1 to either 150 mg of ripretinib once daily or 50 mg of sunitinib once daily for four weeks followed by two weeks without sunitinib. The primary efficacy endpoint is median progression-free survival (mPFS) as determined by independent radiologic review using modified Response Evaluation Criteria in Solid Tumors (RECIST). Secondary endpoints as determined by independent radiologic review using modified RECIST include Objective Response Rate (ORR) and Overall Survival (OS). See www.clinicaltrials.gov for further information (NCT03673501).
About the INVICTUS Phase 3 Study
The INVICTUS Phase 3 clinical study is a randomized, double‑blind, placebo-controlled, global, multicenter trial to evaluate the safety, tolerability, and efficacy of ripretinib compared to placebo in patients with advanced GIST whose previous therapies have included at least imatinib, sunitinib, and regorafenib. This fully enrolled study was designed to support regulatory approvals in fourth-line and fourth-line-plus GIST patients in the United States, Europe and other major markets. Patients were randomized 2:1 to either 150 mg of ripretinib or placebo once daily. The primary efficacy endpoint is median progression-free survival (mPFS) as determined by independent radiologic review using modified Response Evaluation Criteria in Solid Tumors (RECIST). Secondary endpoints as determined by independent radiologic review using modified RECIST include Objective Response Rate (ORR), Time to Tumor Progression (TTP), and Overall Survival (OS). See www.clinicaltrials.gov for further information (NCT03353753).
About Ripretinib
Ripretinib (DCC-2618) is an investigational KIT and PDGFRα kinase switch control inhibitor in clinical development for the treatment of KIT and/or PDGFRα-driven cancers, including gastrointestinal stromal tumors, or GIST, systemic mastocytosis, or SM, and other cancers. Ripretinib was specifically designed to improve the treatment of GIST patients by inhibiting a broad spectrum of mutations in KIT and PDGFRα. Ripretinib is a KIT and PDGFRα inhibitor that blocks initiating and secondary KIT mutations in exons 9, 11, 13, 14, 17, and 18, involved in GIST as well as the primary D816V exon 17 mutation involved in SM. Ripretinib also inhibits primary PDGFRα mutations in exons 12, 14 and 18, including the exon 18 D842V mutation, involved in a subset of GIST.