Kythera Biopharma Says Top-Line Phase III Trial Results for ATX-101 Met Primary, Secondary Endpoints
KYTHERA Biopharmaceuticals, Inc. (Nasdaq: KYTH) today announced that its ATX-101 REFINE-1 and REFINE-2 Phase III trials met all primary and secondary endpoints. These two pivotal Phase III trials were conducted in the U.S. and Canada to compare the efficacy and safety of a 2 mg/cm^2 dose of ATX-101 versus placebo for the reduction of submental fat, which commonly presents as a double chin. ATX-101 is a proprietary formulation of a purified synthetic version of deoxycholic acid, a naturally occurring molecule in the body that aids in the breakdown of dietary fat.^1 If approved, it will be a first-in-class submental contouring injectable drug.
REFINE-1 and REFINE-2 are two identical multicenter, double-blind, randomized, placebo-controlled trials that enrolled more than 1,000 subjects with moderate to severe submental fat in 70 centers in the U.S. and Canada. Validated clinician- and patient-rating scales were used to evaluate primary efficacy endpoints, assessed 12 weeks after the last treatment.
REFINE-1 (Study ATX-101-11-22)
* 70.3 percent of ATX-101 (2mg/cm^2) REFINE-1 subjects demonstrated a simultaneous improvement of at least one grade from baseline on the Clinician-Reported Submental Fat Rating Scale (CR-SMFRS) and Patient-Reported Submental Fat Rating Scale (PR-SMFRS) vs. 18.7 percent in placebo (p<0.001). * 13.4 percent of ATX-101 (2mg/cm^2) REFINE-1 subjects demonstrated a simultaneous improvement of at least two grades from baseline on the Clinician-Reported Submental Fat Rating Scale (CR-SMFRS) and Patient-Reported Submental Fat Rating Scale (PR-SMFRS) vs. 0 percent in placebo (p<0.001).
REFINE-2 (Study ATX-101-11-23)
* 66.9 percent of ATX-101 (2mg/cm^2) REFINE-2 subjects demonstrated a simultaneous improvement of at least one grade from baseline on the Clinician-Reported Submental Fat Rating Scale (CR-SMFRS) and Patient-Reported Submental Fat Rating Scale (PR-SMFRS) vs. 22.4 percent in placebo (p<0.001). * 18.7 percent of ATX-101 (2mg/cm^2) REFINE-2 subjects demonstrated a simultaneous improvement of at least two grades from baseline on the Clinician-Reported Submental Fat Rating Scale (CR-SMFRS) and Patient-Reported Submental Fat Rating Scale (PR-SMFRS) vs. 3.2 percent in placebo (p<0.001).
"The strong results from REFINE-1 and REFINE-2 are incredibly exciting and consistent with the profile of ATX-101 based on previous data," said Frederick Beddingfield, III, M.D., Ph.D., Chief Medical Officer, KYTHERA Biopharmaceuticals, Inc. "We look forward to discussing submission plans with U.S. and Canadian regulatory authorities in the near future. If approved, ATX-101 will represent a significant innovation in the category of aesthetic medicine."
Secondary Efficacy Endpoints
Additionally, an assessment of the trials' first secondary endpoint showed 46.6 percent of REFINE-1 and 40.0 percent of REFINE-2 patients achieved a predefined, statistically significant reduction in the volume of their submental region vs. 5.4 and 5.1 percent for placebo, respectively (both p<0.001), as measured through magnetic resonance imaging (MRI).
Subjects also rated the visual and psychological impacts of submental fat using the Patient-Reported Submental Fat Impact Scale (PR-SMFIS), which assessed whether they perceived themselves to be happier, less bothered, less self-conscious, less embarrassed, younger or less overweight after treatment with ATX-101. Statistical significance was achieved for the change from baseline in PR-SMFIS with 3.63 vs. 1.14, and 3.47 vs. 1.48, for ATX-101 (2mg/cm^2) and placebo for REFINE-1 and REFINE-2, respectively (p<0.001 for both). Each individual component within the PR-SMFIS also demonstrated statistical significance vs. placebo in both trials (p<0.001 for all PR-SMFIS measures).
"The area under the chin is important to patients as it impacts overall facial harmony, balance and attractiveness; however, an undesirable double chin is often undertreated by aesthetic physicians as there is no proven non-surgical option to effectively reduce submental fat," said Jean D. Carruthers, M.D., FRCSC, FRC, REFINE-1 investigator and Clinical Professor, Department of Ophthalmology, University of British Columbia, Vancouver. "ATX-101 could provide a solution that fulfills this unmet need and become an important addition to the overall practice of aesthetics."
There were no treatment-related serious adverse events. The most common adverse events, which were predominantly mild to moderate, were swelling, pain, bruising, numbness and redness. Consistent with previous studies, these adverse events were predominately transient and local to the treatment area. Less than 4 percent of subjects discontinued the study due to adverse events.
Upcoming Scientific Presentation
Additional information from these studies will be reported at the upcoming American Society for Dermatologic Surgery (ASDS) annual meeting, October 3-6 in Chicago.
KYTHERA will host an investor conference call and webcast to discuss the results at 8:00 AM (Eastern Time) on September 17, 2013. Presenting from the Company will be Keith Leonard, President and CEO, and Dr. Frederick Beddingfield, III, Chief Medical Officer.
Individuals interested in participating in the call should dial (877) 344-3890 (U.S. and Canada) or (760) 666-3770 (international) using conference ID number 65266554. To access the webcast, please visit the Investors section of KYTHERA's website at www.kytherabiopharma.com at least 15 minutes prior to the start of the call to ensure adequate time for any software downloads that may be required. A PDF of reference slides will be available during the call.
The call will be available for replay via telephone starting September 17, 2013 at approximately 11 a.m. PDT, running through 11:59 p.m. PDT on October 1, 2013. To listen to the replay, dial (855) 859-2056 (U.S. and Canada) or (404) 537-3406 (international) using conference ID number 65266554. The archived webcast will be available on KYTHERA's website for 14 days beginning approximately one hour after the call has completed.
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