The aim of this study is to describe the outcomes in American Indian patients receiving immunotherapy in a multi-institution retrospective study at several other high-volume centers that care for this patient population and to identify any healthcare disparities that can lead to future interventional studies.

Immune checkpoint inhibitors have been shown to increase survival in metastatic solid tumor patients when compared to the previously standard of care chemotherapy. Epidemiologic studies of American Indian cancer patients demonstrated having significantly worse survival when compared with Caucasians when controlled for age, sex, alcohol abuse, smoking, insurance, and disease stage.

There are no current studies specifically examining the American Indian population receiving treatment with immune checkpoint inhibitors. The aim is to describe the outcomes in American Indian patients receiving immunotherapy in a multi-institution retrospective study at several other high-volume centers that care for this patient population and to identify any healthcare disparities that can lead to future interventional studies.

Inclusion Criteria:

• above age 18,
• histologically and cytologically confirmed NSCLC, melanoma, head and neck squamous cell carcinoma, gastrointestinal cancers,, renal cell carcinoma, or any other solid tumors where immune checkpoint therapy has been used
• received immunotherapy as part of their treatment
• Self-identified American Indian in ethnicity
• Patients at the Stephenson Cancer Center between 2015 to 2021

Exclusion Criteria:

• patients who did not receive immune checkpoint inhibitor therapy

American Indian population is the primary group of interest for this study.