Substudy 02A: Safety and Efficacy of Pembrolizumab in Combination With Investigational Agents in Participants With Programmed Cell-death 1 (PD-1) Refractory Melanoma (MK-3475-02A/KEYMAKER-U02)

Substudy 02A is part of a larger research study that is testing experimental treatments for melanoma, a type of skin cancer. The larger study is the umbrella study. The goal of substudy 02A is to evaluate the safety and efficacy of investigational treatment arms in participants with PD-1 refractory melanoma to identify the investigational agent(s) that, when used in combination, are superior to the current treatment options/historical control available. As of Amendment 4 (effective date: 05JAN2022), a third arm has been opened to participant enrollment, treatment with pembrolizumab and all-trans retinoic acid (ATRA). Enrollment into the first two arms, treatment with pembrolizumab + quavonlimab+ vibostolimab and treatment with pembrolizumab + quavonlimab + lenvatinib has been completed per protocol as of September 2021.