The Phase 1 portion of the study will follow a 3 + 3 dose-escalation design to evaluate twice-daily (BID) administration of LYC-55716 for DLTs and to determine the MTD and the RP2D for further assessment in Phase 2A. A treatment cycle will consist of 28 days of treatment and subjects may continue to receive subsequent cycles of therapy as long as they do not have clinically significant progressive disease.