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Cogent Biosciences Announces Detailed Data from APEX Pivotal Trial of Bezuclastinib in Patients with Advanced Systemic Mastocytosis at the 2026 European Hematology Association (EHA) Congress

$COGTPress releaseJun 12, 2026, 8:00 AM ETRead the release

Cogent Biosciences presented updated pivotal data from the APEX trial of bezuclastinib in advanced systemic mastocytosis (AdvSM) at the EHA Congress. The drug achieved a 65% objective response rate per mIWG criteria and 81% per PPR criteria in 81 treated patients, with 91% showing ≥50% reduction in variant allele frequency.

Key figures

Drug Name
bezuclastinib
Phase Of Trial
Pivotal
Orr ppr
81%
Orr miwg
65%
Os 12month
87%
Pfs 12month
79%
Patients treated
81
Patients evaluable
68
Vaf reduction ge50
91%
Tryptase reduction ge50
89%
Bm mast cell reduction ge50
89%

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