This exploratory phase 1/phase 2 study is designed to establish a recommended phase 2 dose of IMM60 and provide preliminary estimates of safety and efficacy of IMM60 alone and in combination with pembrolizumab in participants with NSCLC and melanoma. In phase 1, initial safety will be assessed in a multiple dose escalation cohort for IMM60 alone, then for the IMM60 + pembrolizumab combination. Phase 2 of the study will recruit PD-1 pretreated melanoma participants and randomize PD-L1 > 50% total NSCLC participants 2:1 to IMM60 + pembrolizumab vs pembrolizumab alone. There is an additional cohort of PD-L1 < 1% NSCLC participants.
The goal of this clinical trial is to learn about IMM60 with or without pembrolizumab in participants with advanced melanoma or non-small cell lung cancer. There are two phases:~Phase 1: This phase is designed to learn about the safety of IMM60 with or without pembrolizumab and to find a safe dose to test in Phase 2.~Phase 2: This phase is designed to learn whether IMM60 + pembrolizumab improves progression-free survival at 12 months compared to pembrolizumab alone in participants with non-small cell lung cancer.