How do you approach treatment for metastatic cutaneous squamous cell carcinoma after standard chemotherapy failure?

Immunotherapy seems to be active in cutaneous squamous cell carcinoma and I think checkpoint inhibitors are a good option for patients who have failed cytotoxic chemotherapy or cannot receive chemo. In an expansion cohort of a phase I study of REGN2810, a PD-1 inhibitor, the response rate in 26 pati...