Immune checkpoint inhibitor (ICI) therapy can predispose patients to immune-related adverse events (irAEs) and autoimmune disease (AD) are-ups, but the characteristics of irAEs among patients with pre-existing ADs are largely unknown. We conducted this study to determine the clinical courses, irAEs, AD ares, treatment, and outcomes of patients with AD on ICIs.
MethodsThis was a retrospective study of adult cancer patients at a large cancer center who were diagnosed with ADs before undergoing ICI therapy. Patients' clinical courses, complications, treatments, and outcomes related to both ADs ares and irAEs were collected and analyzed.
ResultsThe study included 197 patients. Most (55.4%) were women. Melanoma comprised the highest proportion (28.4%) of malignancies, and most (83.8%) patients received PD-1/PD-L1 inhibitors. Fifty (25.3%) patients developed a new irAE after starting ICI therapy, while 29 (14.7%) patients had an AD are-up. Patients with in ammatory bowel disease had the highest incidence of AD are-ups (31.7%), while patients with Hashimoto hypothyroidism had the highest incidence of new irAEs (39.2%). Patients with in ammatory bowel disease had more severe adverse events. In our cohort, patients with a new diagnosis of irAE were treated with immunosuppressive therapy. AD ares were managed similarly. With regard to irAE manifestations, the most common presentations were colitis (24 [12.1%] patients), hepatic transaminase elevations (8 [4%] patients), and pneumonitis (7 [3.5%] patients).
ConclusionOur ndings suggest that patients with gastrointestinal and rheumatologic ADs had a higher incidence of AD are-ups, while patients with Hashimoto hypothyroidism and neurologic ADs had a higher incidence of new irAEs. Patients with prior ADs experiencing are-ups or new irAEs after ICI therapy tend to require aggressive immunosuppressive treatment. Thorough evaluation of baseline disease status, appropriate medical management before ICI therapy, and early recognition of in ammatory exacerbation may help ensure long-term success in treating and improving outcomes in these patients. This retrospective chart review was a descriptive, single-center study that included patients aged 18 years or older who had cancer and who received ICI therapy at The University of Texas MD Anderson Cancer Center from 10/01/2014 to 04/30/2021. All patients included in the study had a con rmed AD diagnosis before the start of ICI therapy (Fig. 1). We identi ed patients aged 18 years or older who (1) were treated with ICI for various types of cancer and (2) had a diagnosis of autoimmune disease prior to the rst base on the past medical history on the study entry note before starting ICI. Patients excluded (1) were patients aged less than 18 years old and (2) did not have a past medical history of AD (Fig. 1). This study was approved by the Institutional Review Board with a waiver of patients' informed consent.
Clinical dataFrom the patients' electronic medical records, we extracted demographic and cancer-related information, such as patie...