The Prostate Cancer Immune Microenvironment, Biomarkers and Therapeutic Intervention

Author:

Zhang Yangyi,Campbell Bethany K.,Stylli Stanley S.ORCID,Corcoran Niall M.,Hovens Christopher M.

Abstract

Advanced prostate cancers have a poor survival rate and a lack of effective treatment options. In order to broaden the available treatments, immunotherapies have been investigated. These include cancer vaccines, immune checkpoint inhibitors, chimeric antigen receptor T cells and bispecific antibodies. In addition, combinations of different immunotherapies and with standard therapy have been explored. Despite the success of the Sipuleucel-T vaccine in the metastatic, castrate-resistant prostate cancer setting, other immunotherapies have not shown the same efficacy in this population at large. Some individual patients, however, have shown remarkable responsiveness to these therapies. Therefore, work is underway to identify which populations will respond positively to therapy via the identification of predictive biomarkers. These include biomarkers of the immunologically active tumour microenvironment and biomarkers indicative of high neoantigen expression in the tumour. This review examines the constitution of the prostate tumour immune microenvironment, explores the effectiveness of immunotherapies, and finally investigates how therapy selection can be optimised by the use of biomarkers.

Funder

National Health and Medical Research Council

Movember Foundation

Australian Federal Government

Publisher

MDPI AG

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