Abstract: The present disclosure provides methods for treating or inhibiting the growth of a tumor, including selecting a patient with cancer, wherein the patient has a tumor with threshold levels of both tumor mutation burden and expression of major histocompatibility complex, and administering to the patient a therapeutically effective amount of programmed death 1 (PD-1) inhibitor (e.g., an anti-PD-1 antibody or antigen-binding fragment thereof). In some embodiments, the cancer is skin cancer, such as basal cell carcinoma or cutaneous squamous cell carcinoma.