SOUTH SAN FRANCISCO, CA--(Marketwired - Aug 13, 2013) - Titan Pharmaceuticals, Inc. (
Key Probuphine findings outlined in the publication include:
- Probuphine results were statistically significant for the trial's protocol defined primary endpoint based on the percentages of urine samples that were negative for illicit opioid use, and incorporating patient self-reported opioid use over the 24-week treatment period (p < 0.0001)
- Patients receiving the Probuphine implant had a higher study completion rate relative to placebo (64 percent vs. 26 percent (p < 0.0001)
- Patients receiving the Probuphine implant had lower clinician-rated (p < 0.0001) and patient-rated (p < 0.0001) withdrawal, lower patient-rated (p < 0.0001) craving and better patients' (p = 0.031) and clinicians' (p = 0.022) global ratings of improvement
- Patients in the Probuphine arm and the SUBOXONE® arms had similar results for the mean number of urines that tested negative for illicit opioids (Probuphine: 36 percent SUBOXONE: 35 percent)
This study of 287 patients was funded by a grant from the National Institute on Drug Abuse (NIDA) and by Titan Pharmaceuticals.
In April 2013, Titan received a Complete Response Letter (CRL) to the New Drug Application (NDA) for Probuphine, requesting, among other things, additional data supporting efficacy and safety of the product and the clinical benefit to patients. Titan and its commercialization partner in the U.S. and Canada, Braeburn Pharmaceuticals, are working closely with regulatory counsel and a team of expert advisors to systematically evaluate the options available to address the issues in the CRL and remain committed to advancing Probuphine.
About Opioid Dependence
According to recent estimates, there are 2.2 million people with opioid dependence in the U.S. Approximately 20 percent of this population is addicted to illicit opioids, such as heroin, and the other 80 percent to prescription opioids, such as oxycodone, hydrocodone, methadone, hydromorphone and codeine. Before the year 2000, medication-assisted therapies for opioid dependence had been sanctioned to a limited number of facilities in the U.S. The Drug Addiction Treatment Act of 2000 (DATA 2000) allowed medical office-based treatment of opioid dependence and greatly expanded patient access to medication-assisted treatments. As a result, an estimated 1.2 million people in the U.S. sought treatment for opioid dependence in 2011.
Probuphine is an investigational subdermal implant designed to deliver continuous and persistent, around the clock blood levels of buprenorphine for six months following a single treatment, and to simplify patient compliance and retention. Buprenorphine, an approved agent for the treatment of opioid dependence, is currently available in the form of daily dosed sublingual tablets and film formulations, with reported 2011 sales of $1.3 billion in the United States.
Probuphine was developed using ProNeura™, Titan's continuous drug delivery system that consists of a small, solid implant made from a mixture of ethylene-vinyl acetate (EVA) and a drug substance. The resulting construct is a solid matrix that is placed subdermally, normally in the upper arm in a simple office procedure, and removed in a similar manner at the end of the treatment period. The drug substance is released slowly and continuously through the process of dissolution resulting in a steady rate of release.
The efficacy and safety of Probuphine has been studied in several clinical trials, including a 163-patient, placebo-controlled study over a 24-week period (published in the Journal of the American Medical Association (JAMA)), and a confirmatory study of 287 patients designed to evaluate efficacy versus placebo, and non-inferiority with a currently marketed sublingual formulation of buprenorphine. Results of the confirmatory study were announced in July 2011.
About Titan Pharmaceuticals
For information concerning Titan Pharmaceuticals, Inc., please visit the company's website at www.titanpharm.com.
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