Evaluation of Anti-PD-1 Therapy by Monitoring T Cell Responses in Melanoma, Lung and Other Cancer Types

Inclusion Criteria: * Are 18 years of age or older * Have histologic evidence of locally or regionally advanced or stage IV malignancy * Are considered appropriate for starting therapy with anti-PD-1/anti-PD-L1 monoclonal antibody by their treating physician (prior therapy with immune checkpoint inhibitor (ICI) is allowed) * Have an understanding of the protocol and its requirements, risks, and discomforts * Are willing to undergo peripheral blood collection at the time points mentioned in the protocol * Are able and willing to sign an informed consent Exclusion Criteria: * Inability on the part of the patient to understand the informed consent or be compliant with the protocol * Patients receiving any concurrent anti-cancer therapy or investigational agents (with the exception of an anti-PD-1/anti-PD-L1 agent as mentioned above) * Patients who are pregnant, nursing, or are of childbearing potential and are unwilling to employ adequate contraception