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Prostate cancer represents one of the leading causes of morbidity and mortality of men worldwide. In precision medicine, tumors are screened for specific genetic alterations known as predictive markers for targeted therapy. In androgen-independent prostate cancer cells and in tissue samples of a prostate cancer patient treated with Goserelin, we identified the self-activating splice variant Rac1b. Importantly, the expression of Rac1b was sufficient to induce AR-dependent gene synthesis. We hypothesized that Rac1b antagonizes androgen depletion induced cancer cell death by blocking pro-apoptotic signalling pathways. In line with that selective knockdown of Rac1b or inhibition of Rac-dependent signalling pathways reinduced apoptosis in androgen-independent prostate cancer cells suggesting Rac1b inhibition as a potential novel therapeutic add on strategy against prostate cancer.

Rac1b Supports Ligand-Independent Androgen Receptor Activation in Prostate Cancer Progression