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Immunotherapy has revolutionized treatment outcomes in numerous cancers. However, clinical trials have largely excluded patients with autoimmune diseases (ADs) due to the risk of AD flares or predilection for developing organ-specific inflammation. The objective of this study was to evaluate the safety and efficacy of immunotherapy in patients with cancer and preexisting ADs. A retrospective, single-center study of patients with cancer initiated on immune checkpoint inhibitors between 2012 and 2019 was conducted. The primary outcome was the development of immune-related adverse events (irAEs) with respect to the presence of AD at baseline. Associations were assessed using Kaplan-Meier curves, bivariate and multivariable analyses. Of the 417 patients included in this study, 63 patients (15%) had preexisting AD…