A Clinical Trial of Three Study Medicines (Encorafenib, Binimetinib, and Pembrolizumab) in Patients With Advanced or Metastatic Melanoma

This study will compare the efficacy, safety, and tolerability of encorafenib and binimetinib plus pembrolizumab (Triplet Arm) versus placebo plus pembrolizumab (Control Arm) in participants with metastatic or unresectable locally advanced BRAF V600E/K mutation-positive melanoma. The study will have an open-label safety lead-in (SLI) phase to determine the safety recommend Phase 3 dose (RP3D) and pharmacokinetics (PK) of encorafenib and binimetinib plus pembrolizumab combination therapy prior to initiation of the randomized Phase 3 part of the study. Two dose levels of encorafenib in combination with binimetinib plus pembrolizumab will be explored in parallel. A minimum of 12 evaluable participants will be enrolled per dose level. During the double-blind randomized Phase 3 part of the study, approximately 216 eligible participants will be randomized in a 1:1 ratio to the Triplet Arm (at RP3D determined in the SLI) or Control Arm (approximately 108 participants per arm). Randomization will be stratified by prior systemic adjuvant therapy and stage of disease by AJCC (ED8).