• Yuji Shibata and Shuji Murakami.
• Department of Respiratory Medicine, Yokohama Medical Center , Yokohama, Japan.
• Expert Opin Drug Saf. 2020 Jun 1; 19 (6): 653-659.

IntroductionThe development of immune checkpoint inhibitors (ICIs), such as anti-programmed death 1/programmed death ligand 1 (PD-1/PD-L1) inhibitors, has been a breakthrough in the treatment of non-small-cell lung cancer (NSCLC). Durvalumab, a PD-L1 inhibitor, has shown survival benefit as a maintenance therapy for patients with unresectable stage III NSCLC following definitive chemoradiotherapy, and is approved by the U.S. Food and Drug Administration and the European Medicines Agency.Areas CoveredIn this article, we review the development of durvalumab, its pharmacology, and its safety profile as a monotherapy and in combination with other agents, including epidermal growth factor receptor-tyrosine kinase inhibitors (EGFR-TKIs), ICIs such as cytotoxic T-lymphocyte antigen 4 (CTLA-4) blockers, and cytotoxic chemotherapy.Expert OpinionICIs, including durvalumab, cause unique side effects, known as immune-mediated adverse events, which are commonly manageable with standard treatment algorithms. The safety profile of durvalumab monotherapy is similar to those of other PD-1/PD-L1 inhibitors. In the PACIFIC trial, durvalumab after radiotherapy resulted in a slight increase in pulmonary toxicity, but most cases were mild. The enhanced effect of ICIs when used in combination therapies is accompanied by an increased risk of side effects. Therefore, the authors evaluated the safety profile and risk-benefit balance of durvalumab combined with various agents.

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