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ARN-509, a synthetic biaryl thiohydantoin compound, is a competitive androgen receptor (AR) inhibitor and fully antagonistic to AR overexpression. The IC50 of ARN-509 is 16 nmol/L [1].

AR, included in the steroid receptor superfamily, is important for prostate cell proliferation and male sexual differentiation [2]. AR overexpression is a common and important feature of castration resistant prostate cancer (CRPC) [1].

ARN-509 (1 μmol/L) treatment for 48 hours resulted in increased DNA damage in LNCaP cells, LNCaP-AR cells and VCaP cells. In LNCaP cell line, treatment with ARN-509 (1 μmol/L) resulted in decreased cell survival. Treatment with ARN-509 (1 μmol/L) for 48 hours significantly decreased C-NHEJ–mediated recombination (>60%) in LNCaP cells that had been transfected with V(D)J recombination substrate along with RAG1 and RAG2 expression vectors [3]. ARN-509 showed robust transcriptional and proliferative agonist activity in AR F876L–expressing cells, and promoted AR DNA binding in LNCaP/SRαF876L cells [4].

Orally treated with ARN-509 (10 mg/kg/d) for 17 days, androgendriven luciferase reporter–gene activity in castrate male immunodeficient mice harboring LNCaP/AR-luc xenograft tumors (coexpressing exogenous AR and the AR-dependent reporter ARR2-Pb-luc), was consistently reduced. This indicated that ARN-509 inhibited AR in vivo. ARN-509 made tumors exhibit a decrease in proliferative index and an increase in apoptotic rate [1].

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