About the Phase 2 TrialThe Phase 2 multicenter, randomized clinical trial evaluated the safety and efficacy of either 1 mg or 3 mg doses of enobosarm, compared to placebo, in 159 patients who had been diagnosed with NSCLC, CRC, NHL, CLL or breast cancer and who had not yet begun chemotherapy or were between chemotherapy cycles. Eligible patients had a body mass index (BMI) of 35 kg/m 2 or less and were men older than 45 years or postmenopausal women. Additional inclusion criteria included at least 2% weight loss in the 6 months before randomization and a life expectancy of more than 6 months. Participants were randomized to receive enobosarm 1 mg or 3 mg or matching placebo orally daily for up to 113 days. The primary objective of the trial was to assess the effects of enobosarm on total lean body mass (muscle). Secondary objectives included assessments of the effects of enobosarm on total body weight, physical function, and quality of life. Baseline demographic (age, sex, race and BMI) and clinical characteristics (cancer type and cancer stage) were much the same across treatment groups. Lean body mass and body fat mass were assessed by dual-energy x-ray absorptiometry (DXA) at baseline and Day 113/end of study. Also, physical function was assessed by a stair climb test at baseline and Day 113/end of study. Efficacy analyses were done in the approximately 100 patients who had both a baseline and an on-treatment assessment within the protocol-specified window for baseline and Day 113/end of study assessments (the “efficacy evaluable population”). All statistical analyses were performed in the efficacy evaluable population except those related to safety and survival, which were performed in the intent to treat (ITT) population (159 subjects randomized in the trial). Results from the trial included the following:
- Cancer patients receiving enobosarm (either 1 mg or 3 mg per day) showed a statistically significant increase from baseline to Day 113/end of trial in total lean body mass and a significant improvement from baseline in the time and power to climb 12 stairs
- Cancer patients receiving placebo during the same period did not show significant increases in total lean body mass and no improvement from baseline in their mean time or power to climb 12 stairs
- In each of the cancers types (NSCLC, CRC and other cancers), an increase in median lean body mass and stair climb power (physical function) was observed for both enobosarm 1 mg and 3 mg, with a greater increase in lean body mass being observed in the CRC patients and the greatest increases in stair climb power being observed in the NSCLC patients
- Although the trial was not powered to assess survival, in a post-hoc analysis, the survival hazard ratio for patients assigned enobosarm 1 mg versus placebo was 0.80 and for those assigned enobosarm 3 mg versus placebo was 0.70, representing a 20% and 30% improvement in survival, respectively
- Enobosarm was generally well tolerated, with the occurrence of serious adverse events and overall pattern of adverse events being much the same among placebo and treatment groups
Forward-Looking Information is Subject to Risk and UncertaintyThis press release contains forward-looking statements based upon GTx's current expectations. Forward-looking statements involve risks and uncertainties, and include, but are not limited to, statements relating to GTx's clinical trials for enobosarm (also known as Ostarine ® or GTx-024). GTx's actual results and the timing of events could differ materially from those anticipated in such forward-looking statements as a result of these risks and uncertainties, which include, without limitation, the risks (i) that GTx will not be able to commercialize its product candidates if clinical trials do not demonstrate safety and efficacy in humans; (ii) that GTx may not be able to obtain required regulatory approvals to commercialize its product candidates in a timely manner or at all; (iii) that clinical trials being conducted by GTx may not be completed on schedule, or at all, or may otherwise be suspended or terminated; or (iv) that GTx could utilize its available cash resources sooner than it currently expects and may be unable to raise capital when needed, which would force GTx to delay, reduce or eliminate its product candidate development programs or commercialization efforts. You should not place undue reliance on these forward-looking statements, which apply only as of the date of this press release. GTx’s annual report on Form 10-K filed with the Securities and Exchange Commission on March 5, 2013 contains under the heading, "Risk Factors", a more comprehensive description of these and other risks to which GTx is subject. GTx expressly disclaims any obligation or undertaking to release publicly any updates or revisions to any forward-looking statements contained herein to reflect any change in its expectations with regard thereto or any change in events, conditions or circumstances on which any such statements are based.