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Article Abstract
Despite high rates of post-surgical recurrence in men with high-risk localized prostate cancer (PCa), there is currently no role for neoadjuvant therapy. Tumor infiltrating regulatory T cells (TI-Tregs) limit the antitumor effects of presurgical androgen deprivation therapy (ADT). Therefore, we designed a neoadjuvant clinical trial to test whether Treg depletion via a non-fucosylated anti-CTLA-4 antibody (BMS-986218) is feasible and augments response to ADT. In this single-center, two-arm, open-label study, 24 men with high-risk localized PCa were randomized to ADT with or without BMS-986218 prior to radical prostatectomy. Treatment was well tolerated and feasible. Mechanistic studies indicated BMS-986218 depleted TI-Tregs by engaging CD16a/ on tumor macrophages, modulated dendritic cells (DCs), and augmented T cell priming. Depth of Treg depletion and increased DC frequencies were quantitatively associated with improved clinical outcome. Overall, this study supports the feasibility and biological activity of neoadjuvant immunotherapy with ADT + Fc-enhanced anti-CTLA-4 in high-risk localized PCa.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11419205 | PMC |
| http://dx.doi.org/10.1101/2024.09.09.24313308 | DOI Listing |
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