KEYNOTE-412 is a phase 3, randomized, placebo-controlled, double-blind trial to determine efficacy and safety of pembrolizumab plus CRT and as maintenance therapy vs placebo plus CRT in LA-HNSCC...Patients will be randomly assigned (1:1) to receive pembrolizumab 200 mg every 3 weeks plus cisplatin-based CRT or placebo plus cisplatin-based CRT...Primary end point is event-free survival and secondary end points are overall survival, safety, and patient-reported outcomes.