Custirsen inhibits the production of clusterin, a protein commonly over-produced in cancer cells and a cause of treatment resistance. Two Phase III studies evaluating custirsen in men with castrate-resistant prostate cancer (CRPC) are ongoing: the SYNERGY clinical trial - designed to evaluate an overall survival benefit for custirsen in combination with first-line docetaxel treatment, and the Prostate Cancer SATURN Trial - which will evaluate a durable pain palliation benefit in patients receiving second-line chemotherapy. Both studies are currently enrolling CRPC patients.
Phase II Data Published in
Data from a Phase II clinical study of custirsen in combination with docetaxel retreatment or mitoxantrone as second-line chemotherapy in patients with metastatic castrate-resistant prostate cancer (mCRPC) was published in the
In the clinical study, custirsen combined with docetaxel retreatment resulted in overall survival of 15.8 months. When custirsen was combined with mitoxantrone, overall survival was 11.5 months. The Phase II study also evaluated pain responses in patients with mCRPC. Overall, the pain response was durable (greater than or equal to three months) in 88 percent of patients who had pain or were on opioids for pain at study entry.
"These are encouraging results because we observed durable pain responses in many patients who had disease progression while on or shortly after first-line docetaxel treatment," said Dr.
The authors concluded that the study's results, which demonstrated feasibility, safety and pain relief, as well as an association of low serum clusterin levels with longer survival, provides a consistent signal that warrants further testing of custirsen combined with second-line chemotherapy in mCRPC.
The abstract can be found at the following link:
Pre-Clinical Data Published in
Pre-clinical data published in the
Heat-shock 90 (Hsp 90) inhibitors trigger the elevation of compensatory survival mechanisms that result in the production of clusterin, leading to cancer cell survival and treatment resistance. Results of this study demonstrated that when custirsen was combined with the Hsp90 inhibitor PF-04929113 or 17-AAG, the compounds worked synergistically to inhibit CPRC tumor cell growth in mice.
"These data support the broad, potential applicability of custirsen in combination with various anti-cancer treatments," said Dr.
The abstract can be found at the following link:
Custirsen is the only compound currently in development designed to inhibit the production of clusterin, a protein commonly over-produced in cancer cells, and one cause of treatment resistance. Unlike opioids or agents that target the androgen receptor, custirsen is mechanistically unique in its ability to impact pain responses via the regulation of NF-kB (nuclear factor kappa-light-chain-enhancer of activated B cells) activity. This is a potential attribute that could contribute to custirsen's clinical benefit in combination with numerous anti-cancer treatments.
Custirsen has received Fast Track designation from the
About OncoGenex Pharmaceuticals
OncoGenex is a biopharmaceutical company committed to the development and commercialization of new cancer therapies that address treatment resistance in cancer patients. OncoGenex has a diverse oncology pipeline, with each product candidate having a distinct mechanism of action and representing a unique opportunity for cancer drug development. OncoGenex and
OncoGenex' Forward Looking Statements
This press release contains forward-looking statements within the meaning of the "safe harbor" provisions of the Private Securities Litigation Reform Act of 1995, including, but not limited to, statements concerning our anticipated product development activities, such as expected clinical trial initiation and completion dates, patient enrollment targets, proposed amendments to our ongoing clinical trial design and the timing and possibility for approval by the FDA thereof, the timing and costs of our product development activities and the potential benefits of our product candidates. All statements other than statements of historical fact are statements that could be deemed forward-looking statements. These statements are based on management's current expectations and beliefs and are subject to a number of risks, uncertainties and assumptions that could cause actual results to differ materially from those described in the forward-looking statements. Such forward-looking statements are subject to risks and uncertainties, including, among others, the risk of delays in our expected clinical trials and the uncertainties regarding patient enrollment rates, the risk that the FDA does not approve our proposed amendment to the Saturn trial design in a timely fashion or at all, the risk that our product candidates do not obtain the requisite regulatory approvals to commercialize, the risk that new developments in the rapidly evolving prostate cancer therapy landscape require additional changes in our clinical trial design or limit the potential benefits of our product and the other factors described in our risk factors set forth in our filings with the Securities and Exchange Commission from time to time, including the Company's Quarterly Report on Form 10-Q for second quarter ended June 30, 2011. The Company undertakes no obligation to update the forward-looking statements contained herein or to reflect events or circumstances occurring after the date hereof, other than as may be required by applicable law.
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