On August 16, 2016, OncoGenex Pharmaceuticals, Inc. (Company) announced results from the final analysis of AFFINITY, the Phase 3 trial of custirsen in men with metastatic castrate-resistant prostate cancer (CRPC) whose disease has progressed after treatment with docetaxel (Filing, 8-K, OncoGenex Pharmaceuticals, AUG 16, 2016, View Source [SID1234515887]). The trial did not meet the primary endpoint of demonstrating a statistically significant improvement in overall survival for patients treated with custirsen in combination with cabazitaxel/prednisone compared to cabazitaxel/prednisone alone. The median overall survival for the custirsen arm was 14.2 months versus 13.4 months for the control arm with a hazard ratio of 0.946. Safety data were consistent with those observed in previous trials of custirsen in CRPC.
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As a result of these data and previous custirsen findings, the Company plans to initiate discussions with the U.S. Food and Drug Administration (FDA) to evaluate options related to an early analysis of the Phase 3 ENSPIRIT trial investigating custirsen in combination with docetaxel as second-line chemotherapy in patients with non-small cell lung cancer. In the Company’s proposal to the FDA, the trial’s hypothesized hazard ratio of 0.75 and the p-value for the final survival analysis will remain the same, with a minimal reduction in power and a small change in the critical hazard ratio from 0.84 to 0.83. The ENSPIRIT trial is over 90% enrolled and more than 80% of the events have occurred. The Company believes this is sufficient to assess the potential effect of custirsen in non-small cell lung cancer.
The Company has also engaged MTS Health Partners, LP as its advisor to assist with the exploration of strategic alternatives.
A copy of the Company’s press release is filed as Exhibit 99.1 to this Current Report on Form 8-K.