On March 28, 2019 ESSA Pharma Inc. (TSX-V: EPI;Nasdaq: EPIX), a pharmaceutical company focused on developing novel therapies for the treatment of prostate cancer, reported the nomination of EPI-7386 as the lead clinical candidate for the treatment of metastatic castration-resistant prostate cancer ("mCRPC") (Press release, ESSA, MAR 28, 2019, View Source [SID1234539332]). 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.
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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.
"We are excited to announce the nomination of EPI-7386 as our lead clinical candidate for the treatment of mCRPC," said David Parkinson, President and Chief Executive Officer of ESSA. "EPI-7386 represents a novel approach to targeting the androgen receptor, one of the most validated targets in oncology. We look forward to bringing this novel drug candidate to patients with mCRPC who have no other treatment options."