OncoGenex Announces Completion of Patient Enrollment in the Borealis-1™ Trial of OGX-427 in Metastatic Bladder Cancer

First of Six ORCA™ Trials to Reach Key Phase 2 Enrollment Milestone

BOTHELL, Wash. and VANCOUVER, British Columbia, July 16, 2013 /CNW/ - OncoGenex Pharmaceuticals, Inc. (NASDAQ: OGXI) today announced that enrollment has been completed in Borealis-1™, a company-sponsored, randomized, placebo-controlled Phase 2 trial of OGX-427 in combination with first-line gemcitabine and cisplatin in patients with metastatic bladder cancer.

Approximately 180 patients have been randomized into Borealis-1 at 55 clinical sites throughout North America and Europe. The three-arm trial randomized patients to receive gemcitabine, cisplatin, and OGX-427 at two dose-levels (600 mg or 1000 mg) vs. gemcitabine, cisplatin, and placebo. The primary endpoint of the trial is overall survival. Additional analyses will be conducted to evaluate benefit/risk of the two dosing levels using clinical benefit, safety and tolerability outcomes for each dose level.

"There are limited treatment options available for patients with metastatic bladder cancer and completion of enrollment in Borealis-1 brings us closer to validating novel therapies, such as OGX-427, that might overcome treatment resistance and extend survival," stated Cindy Jacobs MD, PhD, Executive Vice President and Chief Medical Officer of OncoGenex. "We expect data results to be available in the second-half of 2014, and if the trial is positive, we will initiate discussion with the Food and Drug Administration regarding next steps."

Borealis-1 is one of two ongoing clinical trials of OGX-427 in metastatic bladder cancer. The Borealis-2™ trial is an investigator-sponsored, randomized Phase 2 trial evaluating OGX-427 in combination with docetaxel in patients with advanced or metastatic bladder cancer who have disease progression following first-line platinum-based chemotherapy. This trial is sponsored by the Hoosier Oncology Group and currently enrolling patients. Please visit http://clinicaltrials.gov/show/NCT01780545 for more information.

Worldwide, nearly 400,000 cases of bladder cancer are diagnosed each year, with 30 percent of patients having locally invasive or metastatic disease at the time of diagnosis. Of patients with locally invasive disease, 50 percent will relapse with metastases within two years. Limited options exist for both the first- and second-line treatment of advanced bladder cancer, and the median overall survival times in these settings are approximately 12 to 15 months and 6 months, respectively. Given these short survival times and the fact that bladder cancer patients frequently develop resistance to chemotherapy, there continues to be a high unmet need for additional therapeutic options for this patient population.

OGX-427 is a once-weekly intravenous (IV) experimental drug that is designed to inhibit production of heat shock protein 27 (Hsp27) to disable cancer cells' defenses and overcome treatment resistance. Hsp27 is an intracellular protein that protects cancer cells by helping them survive, leading to resistance and more aggressive cancer phenotypes. Both the potential single-agent activity and synergistic activity of OGX-427 with cancer treatments may increase the overall benefit of existing therapies and augment the durability of treatment outcomes, which could lead to increased patient survival.

The ORCA (Ongoing Studies Evaluating Treatment Resistance in CAncer) program encompasses clinical trials of OGX-427. The ORCA program has recently expanded to encompass six Phase 2 trials in bladder, lung, pancreatic and prostate cancers. For more information on OGX-427 and ORCA, please visit www.OncoGenex.com or www.orcatrials.com.

OncoGenex is a biopharmaceutical company committed to the development and commercialization of new 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 Teva Pharmaceutical Industries Ltd. have entered a global collaboration and license agreement to develop and commercialize OncoGenex' lead drug candidate, custirsen. Custirsen is currently in Phase 3 clinical development as a treatment in men with metastatic castrate-resistant prostate cancer and in patients with advanced, unresectable non-small cell lung cancer. OGX-427 is in Phase 2 clinical development and OGX-225 is currently in pre-clinical development. More information is available at www.OncoGenex.com.

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 completion and design and statements regarding the potential benefits and potential development 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, including, among others, the risk that our product candidates will not demonstrate the hypothesized or expected benefits, the risk of delays in our expected clinical trials, the risk that new developments in the rapidly evolving cancer therapy landscape require changes in our clinical trial plans or limit the potential benefits of our product candidates 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 Annual Report on Form 10-K and Quarterly Reports on Form 10-Q. 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.

Borealis-1™, Borealis-2™ and ORCA™ are registered trademarks of OncoGenex Pharmaceuticals, Inc.

SOURCE: OncoGenex Pharmaceuticals, Inc.

For further information:

Media Contact: Jaime Welch, jwelch@oncogenex.com, 604-630-5403; Investor Relations Contact: Susan Specht, sspecht@oncogenex.com, 425-686-1535



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