Deciphera Pharmaceuticals Announces Nature Medicine Publication of Results from Exploratory ctDNA Analysis from INTRIGUE Phase 3 Study Demonstrating Substantial Clinical Benefit of QINLOCK in 2L GIST Patients with Mutations in KIT Exon 11 and 17/18

Deciphera Pharmaceuticals, Inc. (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 Nature Medicine has published results from a circulating tumor DNA (ctDNA) analysis of the INTRIGUE Phase 3 study of QINLOCK (ripretinib) in GIST patients with mutations in KIT exon 11 and 17/18 only previously treated with imatinib.

The article, titled “Ripretinib versus sunitinib in gastrointestinal stromal tumor: ctDNA biomarker analysis of the phase 3 INTRIGUE trial” is now available online and will be published in a future print issue of Nature Medicine.

“The results published in Nature Medicine provide compelling evidence that QINLOCK may provide progression-free and overall survival benefit to second-line (2L) GIST patients in whom a liquid biopsy reveals primary KIT exon 11 mutations plus secondary mutations restricted to KIT exons 17 and 18. It is the first test that measures heterogeneity of resistance and may allow for a more optimized and targeted treatment plan for people living with this disease,” said Sebastian Bauer, M.D., Medical Oncologist at the West German Cancer Center in Essen and senior author of the manuscript. “This analysis is leading us to consider a new approach in GIST treatment using sensitive and minimally invasive blood tests to identify the specific secondary mutational profile for individual patients in order to tailor their therapy based on the differential activity of QINLOCK and sunitinib seen in the INTRIGUE subgroup analysis.”

“In second-line GIST patients with KIT exon 11 + 17/18 mutations only, treatment with QINLOCK resulted in a 78% reduction in the risk of disease progression and a 66% reduction in the risk of death compared to sunitinib, representing a substantial clinical benefit for these patients,” said Matthew L. Sherman, M.D., Chief Medical Officer of Deciphera. “Our ongoing INSIGHT pivotal Phase 3 study is designed to confirm the exceptional efficacy we observed in this exploratory analysis from INTRIGUE. The INSIGHT study is now open at multiple sites and we are committed to enrolling the study as quickly as possible.”