ESSA Pharma Inc. Announces Filing of Investigational New Drug Application for EPI-506

HOUSTON, TX and VANCOUVER, March 31, 2015  /CNW/ - ESSA Pharma Inc. ("ESSA" or the "Company") (TSX-V: EPI) announced today that it has filed with the Food and Drug Administration ("FDA") in the US an Investigation New Drug ("IND") application related to the Company's proposed clinical trial of EPI-506 in prostate cancer patients.  Approval of the IND application is required in order for ESSA to commence human testing of EPI-506 in the US. 

The IND application is a complete description of the chemistry, non-clinical pharmacodynamics and pharmacokinetics, animal toxicology, manufacturing, and other relevant information related to EPI-506 as a potential treatment for patients with advanced prostate cancer. 

"The novel mechanism of action of EPI-506 holds high potential to successfully treat advanced prostate cancer that is refractory to current therapies." said Dr. Frank Perabo, ESSA's Chief Medical Officer.  "This IND filing is therefore a very important step toward bringing this unique treatment option to patients."

If the FDA review process results in approval to commence human testing of EPI-506, ESSA expects to recruit the first patient into its proposed Phase 1/2 clinical trial of EPI-506 in 3Q/2015.  The Company also intends to seek approval from the Health Protection Branch ("HPB") in Canada to include Canadian sites in the Phase 1/2 study, and plans to file a Clinical Trial Authorization application with the HPB in order to obtain that approval.

EPI-506 was designed to block a novel target on the androgen receptor, the N-terminal domain. Inhibition of the N-terminal domain of androgen receptor has the potential to block tumor growth after current hormone-therapy drugs have failed.  That potential has been demonstrated in several well-accepted in vitro and in vivo studies showing that EPI-506 inhibits tumor growth in those prostate cancer models.  The target patient population for EPI-506 – metastatic castration resistant prostate cancer ("mCRPC") patients who have failed current hormone therapies – represents the greatest unmet medical need in this therapeutic area.

In its upcoming Phase 1/2 clinical trial, ESSA intends to demonstrate the maximum tolerated-dose, pharmacokinetics, safety and efficacy of EPI-506 in treating prostate cancer patients who have failed abiraterone or enzalutamide or both, the current standard-of-care drugs in metastatic CRPC.

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, 2012).  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 6 decades.  Although tumors are often initially sensitive to medical or surgical therapies that decrease levels of testosterone (i.e., ADT), disease progression despite castrate levels of testosterone generally represents a transition to the lethal variant of the disease (mCRPC) and most patients ultimately succumb to the illness. The treatment of mCRPC patients has evolved rapidly over the past 5 years; despite these advances, additional treatment options are needed to improve clinical outcomes in patients, particularly those who fail existing treatments including Abiraterone or Enzalutamide or those that have contraindications to receive those drugs. Over time, patients with mCRPC generally experience continued disease progression, worsening pain, leading to substantial morbidity and limited survival rates.  ESSA's novel approach to blocking the androgen pathway has been shown to be effective in blocking tumor growth when current therapies are no longer effective.

Forward-Looking Statement Disclaimer               

This release contains certain information which, as presented, constitutes "forward-looking information" within the meaning of 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 about the IND application and review process; the Company's intention to recruit patients into its proposed Phase 1/2 clinical trial in July 2015, to seek approval from the HPB in Canada to include Canadian sites in the Phase 1/2 study, and to file a Clinical Trial Authorization application with the HPB in order to obtain that approval; the Company's ability to advance product candidates into, and successfully complete, clinical trials; the implementation of the Company's business model and strategic plans; ESSA's ability to develop and commercialize product candidates; and the accuracy of estimates of the size and characteristics of the markets that may be addressed by ESSA's products and product candidates.

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) obtaining positive results of clinical trials; (ii) obtaining regulatory approvals; and (iii) 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 prospectus dated December 5, 2014 under the heading "Risk Factors", a copy of which is available on ESSA's profile at the SEDAR website at, and as otherwise disclosed from time to time on ESSA's SEDAR profile. Forward-looking statements are made based on management's beliefs, estimates and opinions on the date that statements are made and ESSA undertakes no obligation to update forward-looking statements if these beliefs, estimates and opinions or other circumstances should change, except as may be required by applicable Canadian securities laws. Readers are cautioned against attributing undue certainty to forward-looking statements.


Image with caption: "ESSA Pharma Inc. (CNW Group/ESSA Pharma Inc)". Image available at:

For further information: Bob Rieder, CEO, ESSA Pharma Inc., T: 778-331-0962; 832-831-5958, (ext 108), E:; Dr. Frank Perabo, Chief Medical Officer, ESSA Pharma Inc., T : 832-831-5958, (ext 103), E:

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