RecruitingPhase 2Drug trialGB1211 and Pembrolizumab Versus Pembrolizumab and Placebo in Patients With Metastatic Melanoma and Head and Neck Squamous Cell CarcinomaThe purpose of this study is to determine the objective response of GB1211 and pembrolizumab versus pembrolizumab and placebo in patients with advance metastatic melanoma or head and neck squamous cell carcinoma.