A Phase 1A/1B, Multicenter, Nonrandomized, Open-Label, First-in-Human Study to Evaluate the Safety, Tolerability, Pharmacokinetics, and Efficacy of YL201 as a Single Agent and in Combination With Other Anti-Cancer Therapies in Patients With Advanced Solid Tumors

This is a phase 1, multicenter, nonrandomized, open-label, first-in-human study of YL201 conducted in China and the United States. The study will include 2 parts: a dose escalation part (Part 1) followed by a dose expansion part (Part 2). Part 1 will estimate the MTD/RED(s) in dose escalation cohorts of patients with advanced solid tumors unresponsive to currently available therapies or for whom no standard therapy is available. Part 2 will include patients with selected advanced solid tumor types enrolled at the MTD/RED(s), to better define the safety profile and evaluate the efficacy of YL201.

Drug: YL201 and atezolizumab