Evaluation of arthralgias in adult oncology patients receiving immune checkpoint inhibitors.

Immune checkpoint inhibitors are being commonly used as anticancer therapies to treat malignancies. Immune checkpoint inhibitors have been associated with numerous immune-related adverse events (irAEs). IrAEs are well documented; however, rheumatic irAEs are infrequently reported in published literature. The objective of this single-center retrospective chart review study was to evaluate the incidence of arthralgias with immune checkpoint inhibitor therapy as well as the management of these immune-related events. Patients were included if they received one or more doses of nivolumab, pembrolizumab, atezolizumab, ipilimumab, or a combination of agents within the last year. Exclusion criteria included documented history of autoimmune disease, off-label use of immune checkpoint inhibitor, and non-FDA-approved weight-based dosing. This study included 98 patients for review and identified 11 patients that developed arthralgias with immune checkpoint inhibitor therapy. Median time to event was 63 days. Seven patients were treated with corticosteroids. Immune checkpoint inhibitor therapy was held in six patients with arthralgias. Inflammatory markers were collected for six patients and elevated in four of these cases. One patient was referred to rheumatology. The three patients who had grading of arthralgias were not managed optimally according to guideline recommendations. These findings show that 11% of patients treated with immune checkpoint inhibitors had documented arthralgias, consistent with previous reports in the literature. Also, the report shows that management and treatment of these events at our institution was not consistent between providers. Lastly, collaboration with rheumatology may be essential in managing arthralgias and other rheumatologic irAEs.