Summary
This is a multi-part, randomized, double-blind, placebo-controlled Phase 2 clinical study
comparing the safety and efficacy of bezuclastinib (CGT9486) plus best supportive care
(BSC) with placebo plus BSC in patients with nonadvanced systemic mastocytosis
(NonAdvSM), including indolent systemic mastocytosis and smoldering systemic
mastocytosis, whose symptoms are not adequately controlled by BSC. This study will be
conducted in three parts. Patients in Parts 1a, 1b and 2 will receive bezuclastinib or
placebo, and may roll over onto Part 3 to receive treatment with bezuclastinib.