A safety lead-in with a 3+3 dose de-escalation design for patients (pts) with advanced solid tumors with known tumor TP53 mutation status...The dose of eprenetapopt of 4.5 g/day IV D1-4 and pembrolizumab 200mg IV D3 Q3W was established as the RP2D...Two pts with TP53 mutant NSCLC who received prior anti-PD-1/PD-L1 therapy demonstrated reductions in target lesion size of 27% and 8.2%, respectively...