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Emerging immunotherapies for bladder cancer

Kim, Joseph W.a; Tomita, Yusukeb; Trepel, Janeb; Apolo, Andrea B.c

doi: 10.1097/CCO.0000000000000177
GENITOURINARY SYSTEM: Edited by Arif Hussain
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Purpose of review Inhibition of immune escape mechanisms, such as the programed death-ligand 1 pathway, has demonstrated rapid, durable responses in multiple tumor types, including advanced urothelial carcinoma. This review discusses emerging immunotherapies for urothelial carcinoma in various stages of clinical development.

Recent findings Urothelial carcinoma has a high mutational burden, which may increase the number of tumor antigens and potentially enhance the ability of the immune system to recognize tumor cells as foreign. However, urothelial carcinoma can evade the immune system by downregulating tumor–antigen presentation, upregulating various immune checkpoints, and inactivating cytotoxic T cells. Immunotherapies for urothelial carcinoma target each of these steps to restore immune-mediated cytotoxicity. Many of these agents are in clinical trials for urothelial carcinoma.

Summary Immunotherapies are active in urothelial carcinoma, but only in a fraction of patients, implying the presence of persistent immune escape. Identifying the mechanisms of immune escape and developing rational combinatorial regimens may make the benefit of immunotherapy accessible to a broader population.

aProstate and Urologic Cancers Program, Yale Cancer Center, Yale University School of Medicine, New Haven, Connecticut

bDevelopmental Therapeutics Branch

cGenitourinary Malignancies Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland, USA

Correspondence to Andrea B. Apolo, 10 Center Dr, Rm. 12N226, MSC 1906, Bethesda, MD 20892, USA. Tel: +1 301 451 1984; e-mail: andrea.apolo@nih.gov

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