- Data presented at the 2021
The virtual poster presentation, titled, "Comprehensive preclinical characterization of the mechanism of action of EPI-7386, an androgen receptor N-terminal domain inhibitor," will be presented and available for viewing starting
The preclinical data confirm EPI-7386's target engagement with the NTD of the AR through multiple studies:
- Three separate orthogonal NMR approaches confirm that EPI-7386 binds to the Tau5 region of the NTD
- Cellular thermal shift assays (CETSA) confirm engagement of EPI-7386 with both full length AR (AR-FL) and AR-V567es, a splice variant lacking the ligand-binding domain (LBD)
- Gene expression driven by the AR splice variant, AR-V567es, can be inhibited by EPI-7386 whereas enzalutamide and darolutamide, which bind to the LBD, cannot inhibit AR-V567es-driven gene expression
- Chromatin immunoprecipitation sequencing (ChIP-Seq) data indicate that EPI-7386 inhibits androgen-induced changes at the AR cistrome and when combined with enzalutamide, can completely abrogate genome-wide androgen-induced AR binding
"We are excited by the data presented today, which support ESSA's novel approach to prostate cancer by definitively demonstrating that EPI-7386 binds to the N-terminal domain of the androgen receptor—the primary driver of prostate cancer growth," said Dr.
The poster is available on the 2021
About
ESSA is a clinical-stage pharmaceutical company focused on developing novel and proprietary therapies for the treatment of patients with prostate cancer. For more information, please visit www.essapharma.com and follow us on Twitter under @EssaPharma.
About EPI-7386
EPI-7386 is an investigational, highly-selective, oral, small molecule inhibitor of the N-terminal domain of the androgen receptor. EPI-7386 is currently being studied in a Phase 1 clinical trial (NCT04421222) in men with metastatic castration-resistant prostate cancer ("mCRPC") whose tumors have progressed on current standard-of-care therapies. The Phase I clinical trial of EPI-7386 began in Q3 of 2020 following FDA allowance of the IND and
About Prostate Cancer
Prostate cancer is the second-most commonly diagnosed cancer among men and the fifth-most common cause of male cancer death worldwide (Globocan, 2018). Adenocarcinoma of the prostate is dependent on androgen for tumor progression and depleting or blocking androgen action has been a mainstay of hormonal treatment for over six decades. Although tumors are often initially sensitive to medical or surgical therapies that decrease levels of testosterone, disease progression despite castrate levels of testosterone can lead to metastatic castration-resistant prostate cancer ("mCRPC"). The treatment of mCRPC patients has evolved rapidly over the past 10 years. Despite these advances, many patients with mCRPC fail or develop resistance to existing treatments, leading to continued disease progression and limited survival rates.
Forward-Looking Statement Disclaimer
This release contains certain information which, as presented, constitutes "forward-looking information" within the meaning of the Private Securities Litigation Reform Act of 1995 and/or applicable Canadian securities laws. Forward-looking information involves statements that relate to future events and often addresses expected future business and financial performance, containing words such as "anticipate", "believe", "plan", "estimate", "expect", and "intend", statements that an action or event "may", "might", "could", "should", or "will" be taken or occur, or other similar expressions and includes, but is not limited to, statements regarding preclinical data characterizing the mechanism of action of EPI-7386 supporting ESSA's novel approach to prostate cancer, EPI-7386's ability to inhibit AR-driven biology in both full length and splice variant driven prostate cancer models, and the data supporting the rationale for the Company's upcoming Phase 1/2 combination trials of EPI-7386.
Forward-looking statements and information are subject to various known and unknown risks and uncertainties, many of which are beyond the ability of ESSA to control or predict, and which may cause ESSA's actual results, performance or achievements to be materially different from those expressed or implied thereby. Such statements reflect ESSA's current views with respect to future events, are subject to risks and uncertainties and are necessarily based upon a number of estimates and assumptions that, while considered reasonable by ESSA as of the date of such statements, are inherently subject to significant medical, scientific, business, economic, competitive, political and social uncertainties and contingencies. In making forward looking statements, ESSA may make various material assumptions, including but not limited to (i) the accuracy of ESSA's financial projections; (ii) obtaining positive results of clinical trials; (iii) obtaining necessary regulatory approvals; and (iv) general business, market and economic conditions.
Forward-looking information is developed based on assumptions about such risks, uncertainties and other factors set out herein and in ESSA's Quarterly Report on Form 10-Q dated
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