The Phase II study is evaluating tulmimetostat 350 mg once daily in 6 disease-based cohorts, including ARID1Amut OCCC/EC….Both cohorts are eligible for Stage 2 expansion, with 1 and 2 confirmed partial responses in patients with OCCC and EC, respectively (Table)....These preliminary findings in heavily pre-treated patients with ARID1Amut OCCC/EC support continued investigation of tulmimetostat monotherapy.