• SKIP TO CONTENT
  • SKIP NAVIGATION
  • Patient Resources
    • COVID-19 Patient Resource Center
    • Clinical Trials
    • Search Clinical Trials
    • Patient Notification System
    • What is Clinical Research?
    • Volunteering for a Clinical Trial
    • Understanding Informed Consent
    • Useful Resources
    • FDA Approved Drugs
  • Professional Resources
    • Research Center Profiles
    • Clinical Trial Listings
    • Market Research
    • FDA Approved Drugs
    • Training Guides
    • Books
    • eLearning
    • Events
    • Newsletters
    • JobWatch
    • White Papers
    • SOPs
    • eCFR and Guidances
  • White Papers
  • Trial Listings
  • Advertise
  • COVID-19
  • iConnect
  • Sign In
  • Create Account
  • Sign Out
  • My Account
Home » XenoPort announces results from phase IIb trial

XenoPort announces results from phase IIb trial

March 24, 2011
CenterWatch Staff

XenoPort announced preliminary top-line results from a phase IIb clinical trial of arbaclofen placarbil (also known as AP) as adjunctive therapy in patients with gastroesophageal reflux disease (GERD) who do not experience complete relief of GERD symptoms while being treated with proton pump inhibitors (PPI). In this study, subjects who experienced GERD symptoms despite PPI therapy were randomized to receive a PPI plus placebo, or a PPI plus one of four AP dose regimens (20mg or 40mg of AP dosed once daily (QD), or 20mg or 30mg of AP dosed twice daily (BID)), for six weeks. None of the AP doses showed statistically significant improvements over placebo in the analysis of the primary endpoint. Analyses of key secondary endpoints did not yield consistent results when AP doses were compared to placebo.

The randomized, double-blind, placebo-controlled phase IIb clinical trial was conducted at 58 sites in the U.S. and Canada. The primary efficacy endpoint was percent change from baseline in heartburn events per week with the primary analysis evaluating percent change from baseline in heartburn events at week six. Percent change in weekly heartburn events was analyzed using a repeated measures ANCOVA model. At week six, subjects in the placebo group showed a mean percent reduction in heartburn events of 68%. Although there were trends for improvement over placebo in the AP dose groups, none of the comparisons to placebo reached statistical significance.

AP was safe and generally well tolerated at all dose levels. The most common adverse events in the combined AP dose groups were somnolence, dizziness and nausea that occurred in 16%, 13% and 11% of subjects, respectively, compared to 2%, 3% and 6% of subjects in the placebo group. Most reported adverse events were mild or moderate in severity. Withdrawals due to adverse events were 6% in subjects receiving placebo and 16% in subjects receiving AP. The most common reasons for withdrawal were nausea, somnolence, dizziness and headache, none of which exceeded 5%.

Upcoming Events

  • 24May

    Powering an Effective Oversight Strategy with Clinical and Operational Insights

  • 25May

    2022 WCG Avoca Quality & Innovation Summit: Own the Future

  • 28Jun

    Effective Root Cause Analysis and CAPA Investigations for the Life Sciences

  • 16Oct

    WCG MAGI's Clinical Research Hybrid Conference - 2022 West

Featured Products

  • Spreadsheet Validation: Tools and Techniques to Make Data in Excel Compliant

    Spreadsheet Validation: Tools and Techniques to Make Data in Excel Compliant

  • Surviving an FDA GCP Inspection

    Surviving an FDA GCP Inspection: Resources for Investigators, Sponsors, CROs and IRBs

Featured Stories

  • Protocol-360x240.png

    Avoid Deviations by Making Protocol Review a Team Effort

  • SelectionProcess-360x240.png

    Give Us a Voice: Sites Clamor for a Say on Vendor Selection

  • Convince-360x240.png

    Use Data and Details to Convince Site Leadership to Add Staff

  • AsktheExpertsBadge-360x240.png

    Ask the Experts: Listing Trial Staff and Others on the Statement of Investigator

Standard Operating Procedures for Risk-Based Monitoring of Clinical Trials

The information you need to adapt your monitoring plan to changing times.

Learn More Here
  • About Us
  • Contact Us
  • Privacy Policy
  • Do Not Sell My Personal Information

Footer Logo

300 N. Washington St., Suite 200, Falls Church, VA 22046, USA

Phone 617.948.5100 – Toll free 866.219.3440

Copyright © 2022. All Rights Reserved. Design, CMS, Hosting & Web Development :: ePublishing