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DURECT Announces Top-line Data From BESST (POSIDUR® U.S. Pivotal Phase III Trial)





CUPERTINO, Calif., Jan. 5, 2012 /PRNewswire/ -- DURECT Corporation (Nasdaq: DRRX) announced today top-line results from the U.S. pivotal Phase III clinical study for POSIDUR® known as BESST (Bupivacaine Effectiveness and Safety in SABER trial).  POSIDUR is a post-operative pain relief depot that utilizes DURECT's patented SABER™ technology to deliver bupivacaine and is designed to provide up to three days of pain relief after surgery.  BESST was conducted to measure the safety and efficacy of POSIDUR versus placebo in one abdominal surgical procedure and versus an active comparator (injections of standard bupivacaine) in two other abdominal surgical procedures. The co-primary endpoints were pain intensity as well as the use of opioid analgesics over the first 3 days following surgery.

(Logo: http://photos.prnewswire.com/prnh/20020717/DRRXLOGO)

While the results trended positive for both pain reduction and reduction of supplemental opioid use in the first three days after surgery, they did not reach statistical significance.  There were no signs of systemic safety issues, although local site reactions were observed more frequently in the POSIDUR and SABER-Placebo groups than in the active comparator groups. A full safety assessment is not yet available. 

"POSIDUR continues to appear to be safe based on our preliminary review of the BESST data, which also suggests a reduction in pain associated with surgical incision in all three cohorts," stated James E. Brown, President and CEO.  "After a complete analysis of the BESST data and preparation of integrated safety and efficacy reports combining our previous well controlled studies, we intend to hold a pre-NDA meeting with the FDA."

"Hospira looks forward to DURECT's conversations with the FDA, and we support their efforts," stated Sumant Ramachandra, M.D., Ph.D., senior vice president, Research & Development and Medical & Regulatory Affairs, and chief scientific officer, Hospira, Inc. (NYSE: HSP) "We continue to believe in the importance of bringing non-opiate pain management solutions to market."  POSIDUR is licensed to Hospira for commercialization in the U.S. and Canada.

BESST Top-Line Results Primary Endpoints – Cohort 3 (POSIDUR versus SABER-Placebo, laparoscopically-assisted colectomy)With respect to the co-primary efficacy endpoint of pain reduction as measured by mean pain intensity on movement (normalized) Area Under the Curve (AUC) during the period 0-72 hours post-dose, the patient group treated with POSIDUR 5.0 mL (660 mg) reported a mean pain reduction in pain scores of approximately 7% (p=0.1466).  The statistical analysis plan included pain on movement as recorded at scheduled times through an electronic diary plus pain scores reported whenever supplemental opioids were administered with such scores attributed as if they were pain on movement.  In the prespecified sensitivity analysis (which includes only scheduled pain assessment on movement scores as collected on the electronic diary), the patient group treated with POSIDUR 5.0 mL reported approximately 10% less pain versus placebo (p=0.0410).  In relation to the co-primary efficacy endpoint of median total morphine-equivalent opioid dose for supplemental analgesia during the period 0-72 hours post-dose, the patient group treated with POSIDUR reported approximately 16% less opioids consumed versus the placebo group (p=0.5897).  The prespecified level for statistical significance is p<0.05, unless one of the co-primary efficacy endpoints is not met in which case the standard for statistical significance for the remaining endpoint is p<0.025.

Cohorts 1 and 2 (POSIDUR versus commercially available Bupivacaine HCl solution after laparotomy and after laparoscopic cholecystectomy, respectively)Cohorts 1 and 2 were prespecified to be pooled due to their small sample size. With respect to Cohorts 1 and 2 (pooled), the mean reduction in pain on movement was approximately 20% (p=0.0111) for the POSIDUR group compared to the patient group treated with bupivacaine HCl.  In relation to median total morphine-equivalent opioid dose for supplemental analgesia during the period 0-72 hours post-dose for Cohorts 1 and 2 (pooled), the patient group treated with POSIDUR reported approximately 18% less opioids consumed compared to the bupivacaine HCl group (p=0.5455).

SafetyOverall, the POSIDUR patient groups showed a similar systemic safety profile as the patient groups treated with SABER-Placebo and active comparator.  There were no signs of systemic safety issues.  Local site reactions were observed more frequently in the POSIDUR and SABER-Placebo groups than in the active comparator groups; most of these observations were discolorations, the majority of which resolved without treatment during the trial.  No negative safety signal has been seen in the initial cardiac and neurologic safety assessment in BESST; however further analysis is underway.

About the Design of BESST BESST is an international, multi-center, randomized, double-blind, controlled trial evaluating the safety, efficacy, effectiveness, and pharmacokinetics of POSIDUR in 305 patients undergoing a variety of general abdominal surgical procedures.   A total of 48 patients were randomized in Cohort 1, 50 patients were randomized in Cohort 2, and 207 patients were randomized in Cohort 3. 



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