Primary Endpoint Of Clinical Trial Achieved For Remoxy

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DURECT Corporation announced that the pivotal Phase III trial for Remoxy had successfully met its primary endpoint (p<0.01) that was prospectively defined by the U.S. Food and Drug Administration (FDA) during the Special Protocol Assessment process. Remoxy, an investigational drug based on DURECT's patented ORADUR technology, is an abuse-deterrent version of long-acting oxycodone, a powerful painkiller available only by prescription. Remoxy is intended to meet the needs of physicians or pharmacists who appropriately prescribe or dispense long-acting oxycodone and who seek to minimize the risks of abuse, misuse or diversion.

These successful results were reported today by Pain Therapeutics and King Pharmaceuticals; Pain Therapeutics is DURECT's licensee of the rights to this investigational drug, and they in turn have sublicensed the commercialization rights to King Pharmaceuticals. According to Pain Therapeutics and King Pharmaceuticals, the FDA has agreed in writing that a single Phase III pivotal study is needed to support the regulatory approval of Remoxy. As a result, Pain Therapeutics has stated that they expect to file a New Drug Application for Remoxy in Q2 2008.

"These positive clinical trial results represent a major validating milestone for the ORADUR technology which has the potential to serve as a platform for multiple drugs that require controlled release in an abuse deterrent form, and it takes us one step closer to the first NDA filing based on our ORADUR technology," stated James E. Brown, DVM, President and CEO of DURECT. "The abuse of pain medications is a widespread problem in this country and addressing that issue is clearly in the public interest."

Pivotal Remoxy Phase III Study (as reported by Pain Therapeutics and King Pharmaceuticals)

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Design

This pivotal Phase III randomized, double-blinded, placebo-controlled, multi-center study was designed to evaluate the analgesic efficacy of twice- daily Remoxy versus placebo over a 12-week treatment period. The study randomized 412 male and female patients. All patients were diagnosed with osteoarthritis of the knee or hip, as evidenced by x-ray and clinical criteria of the American College of Rheumatology. Additionally, all patients had pain intensity scores corresponding to moderate-to-severe pain.

Following informed consent, wash-out and dose titration, patients were randomized (1:1) into a double-blinded treatment period (12 weeks). During treatment, patients received twice-daily Remoxy or matching placebo. The total drug dose per patient per day ranged from 10-80mg. Pain intensity scores were assessed on a Likert pain scale. Concomitant pain medications or rescue medications were not allowed at any point during the 12-week treatment period.

This Remoxy study received a Special Protocol Assessment (SPA) from the FDA. With an SPA, the study design, endpoints and statistical analyses needed to support approval were agreed upon by the FDA prior to initiating the study and are considered binding.
Results

Pursuant to an SPA, the primary endpoint was defined as mean decrease in pain intensity scores between Remoxy and placebo during the 12-week treatment period. Top-line data indicates that the study achieved a statistically significant result in its primary endpoint (p<0.01). In addition, the study achieved statistically significant results in secondary endpoints such as Quality of Analgesia (p<0.01) and Global Assessment (p<0.01). No drug-related safety issues were noted in this study.

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