Here we report the results in the EC cohort treated at the RP2D. 2 of the 4 evaluable EC pts at the RP2D achieved a partial response (PR). 1 PR was observed on cycle 7 (the only medium FRα level pt) and the second PR was on cycle 3. One pt. had SD after 4 cycles and remains on treatment, and 1 pt progressed in the 1st cycle. The combination of MIRV with G has promising clinical activity in FRα-positive EC.