This phase III trial is comparing survival outcomes for patients with high-risk cutaneous squamous cell carcinoma who are treated with adjuvant immunotherapy (cemiplimab), compared to those who are treated with a placebo, after surgery and radiotherapyA Randomized, Placebo-Controlled, Double-Blind Study of Adjuvant Cemiplimab Versus Placebo After Surgery and Radiation Therapy in Patients With High Risk Cutaneous Squamous Cell Carcinoma

Exclusion

• Squamous cell carcinomas (SCCs) arising in non-cutaneous sites as defined in the protocol
• Concurrent malignancy other than localized CSCC and/or history of malignancy other than localized CSCC within 3 years of date of randomization as defined in the protocol
• Patients with hematologic malignancies (note: patients with chronic lymphocytic leukemia (CLL) are not excluded if they have not required systemic therapy for CLL within 6 months of enrollment)
• Patients with history of distantly metastatic CSCC (visceral or distant nodal), unless the disease-free interval is at least 3 years (regional nodal involvement of disease in draining lymph node basin that was resected and radiated prior to enrollment will not be exclusionary)
• Ongoing or recent (within 5 years of randomization date) evidence of significant autoimmune disease that required treatment with systemic immunosuppressive treatments, which may suggest risk for immune-related adverse events (irAEs). The following are not exclusionary: vitiligo, childhood asthma that has resolved, type 1 diabetes, residual hypothyroidism that required only hormone replacement, or psoriasis that does not require systemic treatment.
• Has had prior systemic anti-cancer immunotherapy for CSCC

Note: Other protocol defined Inclusion/Exclusion criteria apply