VANCOUVER, British Columbia
April 23, 2014
/PRNewswire/ -- OncoGenex Pharmaceuticals, Inc. (NASDAQ: OGXI) today announced that the U.S. Food and Drug Administration (FDA) has granted Fast Track designation to the investigation of custirsen when administered in combination with cabazitaxel/prednisone for the treatment of men with metastatic castrate-resistant prostate cancer (CRPC) following prior treatment with a docetaxel-containing regimen.
Fast track is a process designed to facilitate the development, and expedite the review, of drugs to treat serious conditions and fill an unmet medical need. The purpose is to get important new drugs to the patient earlier.
The international, randomized, open-label Phase 3 AFFINITY trial is designed to evaluate if custirsen, when combined with second-line chemotherapy cabazitaxel and prednisone, has the potential to improve survival outcomes for prostate cancer patients compared to second-line chemotherapy alone. AFFINITY will enroll approximately 630 men and is expected to complete enrollment in the second half of 2014.
Custirsen has also received Fast Track designation from the FDA for treatment of patients with metastatic non-small cell lung cancer as part of the Phase 3 ENSPIRIT trial and for men with metastatic CRPC as part of the Phase 3 SYNERGY trial. Enrollment in the ENSPIRIT trial is ongoing and top-line survival results from SYNERGY are expected by mid-2014.
For more information on the AFFINITY trial, including centers currently enrolling patients, please visit
Custirsen is an experimental drug that is designed to block the production of the protein clusterin, which may play a fundamental role in cancer cell survival and treatment resistance. Clusterin is upregulated in tumor cells in response to treatment interventions such as chemotherapy, hormone ablation and radiation therapy and has been found to be overexpressed in a number of cancers, including prostate, lung, breast and bladder. Increased clusterin production has been linked to faster rates of cancer progression, treatment resistance and shorter survival duration. By inhibiting clusterin, custirsen is designed to alter tumor dynamics, slowing tumor growth and resistance to partner treatments, so that the benefits of therapy, including survival, may be extended.
As part of Phase 1 and Phase 2 clinical trials, custirsen was administered to 294 patients with various types of cancer. The majority of adverse events were mild. The most common adverse events associated with custirsen consisted of flu-like symptoms. The most common serious adverse events (SAE) associated with custirsen were febrile neutropenia, fever, pleural effusion, and dyspnea. Each SAE event was observed in approximately 2%-4% of patients.