Incidence and average cost per toxicity in patients treated with nivolumab.

93Background: Recently approved PD-1 inhibitors such as nivolumab have demonstrated clear efficacy in metastatic melanoma and other cancers, but also come at a high cost and with the potential for severe side effects. However, most of the data available comes from clinical trials rather than patients treated in clinical practice as standard-of-care. This study reports the incidence of severe toxicities in a number of cancer types and estimates the per patient cost of managing these toxicities. Methods: Patients with metastatic melanoma, non-small cell lung cancer, renal cell carcinoma, and Hodgkin’s lymphoma treated with nivolumab between January 1, 2014 through April 30, 2016 were identified at Moffitt Cancer Center (N=74). Toxicities occurring during treatment or within 2 months of stopping treatment were identified by a chart review and each toxicity graded using the CTCAE 4.0 criteria. A cost of care analysis was performed to estimate the cost of serious toxicities (Grade 3-5) compared to a control gr...