Partial Clinical Hold on Leukemia Therapy
FDA has placed a partial clinical hold on a Foghorn Therapeutics Phase 1 dose escalation study of FHD-286 in relapsed or refractory acute myelogenous leukemia (AML) and myelodysplastic syndrome (MDS). The hold follows a report on the recent death of a subject with potential differentiation syndrome, which is associated with AML/MDS therapeutics, according to the company. Inducing differentiation is an effect that is believed to be on-target for the proposed mechanism of action for FHD-286, it says, adding that the agency has requested a “review of the safety database, risk mitigation strategies and a breakdown of clinical activity across dose levels.”
Under the partial hold, patients getting treatment benefits may continue to receive treatment, although no new patients can be enrolled until the hold is lifted. The company says an FHD-286 dose escalation Phase 1 study in metastatic uveal melanoma is not affected by the hold.
Foghorn Therapeutics describes FHD-286 as a highly potent, selective, allosteric and orally available, small-molecule, enzymatic inhibitor of BRG1 and BRM, “two highly similar proteins that are the ATPases, or the catalytic engines across all forms of the BAF complex, one of the key regulators of the chromatin regulatory system. In preclinical studies, FHD-286 has shown anti-tumor activity across a broad range of malignancies including both hematologic and solid tumors.”