ESSA Pharma Inc. announced the nomination of EPI-7386 as the lead clinical candidate for the treatment of metastatic castration-resistant prostate cancer ("mCRPC"). EPI-7386 is a novel drug candidate that inhibits the N-terminal domain of the androgen receptor. Through this novel mechanism of action, EPI-7386 displays activity in vitro in numerous prostate cancer models including models where current antiandrogens are inactive. Compared to ESSA's first generation compound, ralaniten acetate, EPI-7386 is significantly more potent, metabolically stable and more effective in preclinical studies. In addition, EPI-7386 has demonstrated a favorable tolerability profile in all animal studies of the compound conducted to date. IND-enabling studies are currently underway, and ESSA expects to enter clinical studies with EPI-7386 in the first quarter of 2020. As recently presented at the 2019 Genitourinary Cancers Symposium, EPI-7386 demonstrates in vitro cellular potency against the androgen receptor in a similar range to the leading antiandrogens, bicalutamide and enzalutamide. Importantly, EPI-7386 shows activity in numerous in vitro models of antiandrogen resistance driven by the AR-V7 splice variant of the androgen receptor while enzalutamide is inactive. In addition, EPI-7386 is metabolically stable in liver microsome and hepatocyte preparations and shows a favorable pharmacokinetic profile in mice, exhibiting significant exposure and a long half-life. Lastly, EPI-7386 (60 mg/kg) displayed comparable activity to enzalutamide (30 mg/kg) in a prostate cancer LNCaP xenograft mouse model in which enzalutamide mouse exposure was estimated to be twice the clinical exposure of enzalutamide in humans.