Cogent Biosciences Inc. is now lining up two NDA submissions for its tyrosine kinase inhibitor bezuclastinib in treating two forms of cancer. Cogent intends to submit an NDA for bezuclastinib, a tyrosine kinase inhibitor that targets and inhibits mutated KIT proteins, specifically KIT D816V, in the first half of 2026 to treat gastrointestinal stromal tumors. That will follow the company’s plans for an NDA submission for bezuclastinib in treating non-advanced systemic mastocytosis before the end of 2025.

Cogent Biosciences Inc. is eyeing an NDA submission to the U.S. FDA by the end of this year in the wake of positive top-line results from the registration-directed second part of the Summit phase II trial testing bezuclastinib in non-advanced systemic mastocytosis (SM). The data show clinically meaningful and highly statistically significant improvements in SM across the primary and all key secondary endpoints, including patient-reported symptoms and objective measures of mast cell burden.

Wall Street’s measure of how Cogent Biosciences Inc.’s KIT D816V inhibitor bezuclastinib (often shortened to bezu) might fare in mastocytosis against U.S. FDA cleared Ayvakit (avapritinib), the tyrosine kinase inhibitor from Blueprint Medicine Corp., caused the former’s stock (NASDAQ:COGT) to tumble, closing Dec. 11 at $4.06, down $4.58, or 53%. Data from the ongoing phase II Summit trial testing bezu in non-advanced systemic mastocytosis rolled out during the American Society of Hematology (ASH) meeting in San Diego. Waltham, Mass.-based Cogent’s prospect turned up a rapid and continuing improvement in patient symptoms, with a 57% median best improvement on Mast Cell Quality-of-Life.

Blueprint Medicines Corp. scored a broader label from the U.S. FDA for Ayvakit (avapritinib), which became the first approved therapy to treat adults with indolent systemic mastocytosis (ISM).

“No good data goes unpunished in this market,” H.C. Wainwright analyst Andrew Fein wryly noted in an Aug. 17 research report highlighting Wall Street’s dismal response to Blueprint Medicines Corp.’s positive top-line readout of the registrational Pioneer study, in which KIT inhibitor Ayvakit (avapritinib) met the primary and all key secondary endpoints in patients with non-advanced systemic mastocytosis.

Analysts have already started tagging Cogent Biosciences Inc.’s bezuclastinib as potentially best in class, after the company presented impressive, though early stage, data at the European Hematology Association Congress in Vienna demonstrating promising efficacy and a possibly differentiating safety profile for the selective KIT D816V inhibitor in advanced systemic mastocytosis.