Intralesional Cemiplimab for Adult Patients With Cutaneous Squamous Cell Carcinoma or Basal Cell Carcinoma

Key Inclusion Criteria 1. Dose Escalation: History of recurrent resectable CSCC or BCC (Cohort C and I only) that satisfies conditions as defined in the protocol 2. Patients must have measurable disease in the index lesion, defined as 1-2 cm in the longest diameter 3. Eastern Cooperative Oncology Group (ECOG) performance status ≤1 Key Exclusion Criteria 1. Ongoing or recent (within 5 years) evidence of significant autoimmune disease that required treatment with systemic immunosuppressive treatments, which may suggest risk for immune-mediated adverse events (imAEs) 2. Prior treatment with an agent that blocks the programmed cell death 1 (PD-1)/ programmed cell death 1 ligand (PD-L1) pathway. 3. Prior treatment with other systemic immune modulating agent as defined in the protocol 4. M1 or N1, N2 (a, b, or c), or N3 CSCC or BCC. Patients with history of metastatic CSCC (distant or nodal), or metastatic BCC (distant or nodal) are excluded unless the disease-free interval is at least 3 years 5. Concurrent malignancies, other than those with negligible risk of metastasis or death. Patients with hematologic malignancies, including chronic lymphocytic leukemia (CLL), are excluded. 6. Patients with a history of solid organ transplant 7. Has received a Coronavirus induced disease of 2019 (COVID-19) vaccination (initial series and booster) within 1 week of planned start of study medication Note: Other protocol defined Inclusion/Exclusion criteria apply.