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Cancer stem cells (CSCs) virtually present in all tumors albeit in small numbers are primarily responsible for driving cancer progression, metastasis, drug resistance, and recurrence. Prostate cancer (PCa) is the second most frequent cancer in men worldwide, and castration resistant prostate cancer (CRPC) remains a major challenge despite the tremendous advancements in medicine. Currently, none of the available treatment options are effective in treating CRPC. We earlier reported that VNPP433‐3β, the lead next‐generation galeterone analog is effective in treating preclinical  in vivo  models of CRPC. In this study using RNA‐seq, cytological, and biochemical methods, we report that VNPP433‐3β inhibits prostate CSCs by targeting key pathways critical to stemness and epithelial–mesenchymal transition. VNPP433‐3β inhibits CSCs in PCa, presumably by degrading the androgen receptor (AR) thereby decreasing the AR‐mediated transcription of several stem cell markers including BMI1 and KLF4. Transcriptome analyses by RNA‐seq, Ingenuity Pathway Analysis, and Gene Set Enrichment Analysis demonstrate that VNPP433‐3β inhibits transcription of several genes and functional pathways critical to the prostate CSCs thereby inhibiting CSCs in PCa besides targeting the bulk of the tumor.

molecular carcinogenesis

Transcriptome profiling reveals that VNPP433‐3β, the lead next‐generation galeterone analog inhibits prostate cancer stem cells by downregulating epithelial–mesenchymal transition and stem cell markers