Patient Preference for Subcutaneous vs. Intravenous Immune Therapy

Inclusion Criteria: * Able to understand and willing to sign a written informed consent document. * Able to read and write in English. * Must be eligible to receive nivolumab (Cohorts A-1, B-1) or pembrolizumab (Cohorts A-2, B-2) singly or in combination with other FDA-approved agents (TKIs or chemotherapy) according to standard of care practices, as determined by the clinical judgment of the investigator. * Prior and concurrent therapy criteria o Patients should either be ICI-naïve (Cohorts A-1, A-2) or be currently receiving adjuvant or front-line PD-(L)1 based therapy singly or in combination with FDA-approved agents (TKIs or chemotherapy) (Cohorts B-1, B-2). * Locally advanced or advanced/metastatic solid tumor for which nivolumab OR pembrolizumab is on-label. * NOTE: IV nivolumab is FDA-approved in the following indications: RCC, melanoma, NSCLC, SCCHN, UC, dMMR/MSI-H CRC, HCC, esophageal cancer, and gastric, gastroesophageal and esophageal adenocarcinoma (gastric/GEJ). * NOTE: IV pembrolizumab is FDA-approved in the following indications: RCC, melanoma, NSCLC, SCCHN, UC, dMMR/MSI-H CRC, HCC, esophageal cancer, gastric/GEJ, cervical cancer, cutaneous squamous cell carcinoma (cSCC), Merkel cell carcinoma (MCC), endometrial carcinoma, tumor mutational burden-high (TMB-H) cancers, triple negative breast cancer (TNBC). * Cohort-specific criteria. * Cohort A-1: Patients who are treatment-naive (i.e. for whom nivolumab is planned but has not yet been initiated) are…