Summary
Eligible participants will be randomly allocated to one of four research arms.
In Arm 1 (Experimental), participants will receive nemvaleukin (6 µg/kg/day; Days 1 through 5 of 21-day cycles; IV infusion over 30 minutes) plus pembrolizumab (200mg; Day 1 of 21-day cycles; IV infusion over 30 minutes).
In Arm 2 (Experimental), participants will receive pembrolizumab alone (200 mg; Day 1 of 21-day cycles; IV infusion over 30 minutes).
In Arm 3 (Experimental), participants will receive nemvaleukin alone (6 µg/kg/day; Days 1 through 5 of 21-day cycles; IV infusion over 30 minutes).
In Arm 4 (Active Comparator), participants will receive the Investigator's choice of chemotherapy, either: pegylated liposomal doxorubicin (PLD), paclitaxel, topotecan, or gemcitabin. The Investigator will pre-select the Investigator's choice treatment before the randomization of each participant.
PLD will be administered at 40 mg/m2; Day 1 of 28-day cycles; IV infusion; 1 mg/min (Cycle 1); 60 min infusion (Cycles 2+). Paclitaxel will be administered at 80 mg/m2; Days 1, 8, 15, and 22 of 28-day cycles; IV infusion over 60 min. Topotecan will be administered at 4 mg/m2; Days 1, 8, and 15 of 28-day cycles; or 1.25 mg/m2, Days 1 through 5 of 21-day cycles; IV infusion over 30 min. Gemcitabine will be administered at 1,000 mg/m2; Days 1 and 8 of 21-day cycles; IV infusion over 30 min.