Study to Investigate the Safety, Pharmacokinetics, Pharmacodynamics and Preliminary Clinical Activity of Defactinib in Combination With Avelumab in Epithelial Ovarian Cancer

The study is comprised of 2 sequential parts: Part A (Dose Escalation of VS-6063) and Part B (Expansion). In Part A (Dose Escalation), approximately 18 subjects will receive avelumab IV treatment in 28-day cycles (10 mg/kg over approximately 1 hour on Days 1 and 15) and oral defactinib twice-daily (BID) continuously starting on Day 1 of Cycle 1. Subject enrollment will proceed according to a standard 3+3 design. In the absence of dose-limiting toxicity (DLT), each subject will receive the study drug regimen for a minimum of 28 days (Cycle 1) and may continue to receive additional cycles of study treatment until disease progression has been documented or unacceptable toxicity or other treatment discontinuation criteria have been met. All subjects in a cohort must have completed at least 1 cycle of dosing before dose escalation involving new subjects entered into the next dose cohort can occur. Based on the safety and PK data obtained in the dose escalation portion of the study, the RP2D of the combination will be determined. In Part B (Expansion), approximately 80 subjects will be enrolled and will receive avelumab IV treatment in 28-day cycles (10 mg/kg over approximately 1 hour on Days 1 and 15) and oral defactinib at the RP2D dose continuously starting on Day 1 of Cycle 1.