Kinnate Biopharma Inc., a biopharmaceutical company focused on the discovery and development of small molecule kinase inhibitors for difficult-to-treat, genomically defined cancers, today announced that the U.S Food and Drug Administration (FDA) has cleared the company’s Investigational New Drug (IND) application for KIN-3248, a next-generation pan-FGFR inhibitor being developed for intrahepatic cholangiocarcinoma (ICC) and urothelial carcinoma (UC).

"The IND clearance for KIN-3248 is another important validation of our Kinnate Discovery Engine and an exciting step forward in our mission to deliver new therapies to patients with difficult-to-treat, genomically-defined cancers,” said Nima Farzan, Chief Executive Officer of Kinnate. “By targeting clinically relevant primary FGFR driver alterations and secondary resistance mutations, including FGFR2 and FGFR3 gatekeeper, molecular brake, and activation loop mutations, we believe that KIN-3248 is unique among FGFR inhibitors and has the potential to extend the clinical response of cancer patients with FGFR-altered tumors.”

KIN-3248 is an irreversible, small molecule pan-FGFR inhibitor that has been developed to address both primary FGFR2 and FGFR3 oncogenic alterations and those predicted to drive acquired resistance to current FGFR-targeted therapies, including gatekeeper, molecular brake, and activation loop mutations observed in cancers such as ICC and other gastrointestinal cancers. In preclinical studies, KIN-3248 demonstrated inhibitory activity across a wide range of clinically relevant mutations that drive primary disease and acquired resistance.

The Phase 1 trial is expected to initiate in the first half of 2022 and will evaluate the safety, tolerability, pharmacokinetics, pharmacodynamics and anti-cancer activity of KIN-3248 in FGFR inhibitor naïve and pretreated cancer patients with FGFR2 and/or FGFR3 gene alterations. The dose escalation portion (Part A) of the trial will determine the recommended dose and schedule of KIN-3248 for further evaluation in patients with FGFR2 and/or FGFR3 gene alterations. The dose expansion phase (Part B) of the trial will assess the safety and efficacy of KIN-3248 at the recommended dose and schedule in FGFR inhibitor naïve and pretreated patients with cancers driven by FGFR2 and/or FGFR3 gene alterations, including ICC, UC and other selected adult solid tumors.

Oncogenic FGFR (FGFR1, FGFR2, FGFR3, and FGFR4) gene alterations are observed in approximately 7% of all human cancers. FGFR2 gene fusions and FGFR3 activating alterations are predicted oncogenic drivers in approximately 10-20% of cholangiocarcinoma and 20-35% of urothelial cancers, respectively. While currently approved FGFR inhibitors and those in development provide clinical benefit in these cancer indications, disease progression typically occurs within 6-12 months of starting treatment and is often associated with the emergence of on-target resistance mutations within the FGFR kinase domain.