GTx, Inc. (Nasdaq: GTXI) today announced that the ASTRID Trial, a Phase 2 double-blind, placebo-controlled clinical trial of orally-administered enobosarm (3 mg or 1 mg) in post-menopausal women with stress urinary incontinence (SUI), did not achieve statistical significance on the primary endpoint of the proportion of patients with a greater than 50% reduction in incontinence episodes per day compared to placebo. The percentage of patients with a greater than 50% reduction after 12 weeks of enobosarm treatment was 58.9% for 3mg, 57.7% for 1mg and 52.7% for placebo. Enobosarm was generally safe and well tolerated. Reported adverse events were minimal and similar across all treatment groups.

“We are very disappointed that the ASTRID Trial did not achieve its primary endpoint,” said Robert J. Wills, Ph.D., Executive Chairman of GTx. “We plan to conduct a full review of all the data. We want to thank the patients, physicians, study coordinators and the entire GTx team for their support of this novel study. We have an ongoing preclinical program assessing the potential of SARDs, our novel selective androgen receptor degrader technology, to treat castration-resistant prostate cancer. We are currently on target to have development candidates by year end, which we potentially plan to take into IND-enabling studies.”

About the ASTRID Trial

The ASTRID (Assessing Enobosarm for Stress Urinary Incontinence Disorder) Trial is a double-blind, placebo-controlled, parallel design, Phase 2 study to assess clinical activity and safety of enobosarm (GTx-024) in postmenopausal women with Stress Urinary Incontinence (SUI). The trial enrolled 493 women and was conducted at over 60 clinical trial centers across the United States. To learn more about the ASTRID clinical trial, click here.

About Stress Urinary Incontinence

Stress urinary incontinence (SUI) refers to the unintentional leakage of urine during activities that increase abdominal pressure such as coughing, sneezing or physical exercise. SUI, the most common type of incontinence suffered by women, affects up to 35 percent of adult women. There are a variety of treatments that are used to treat SUI in women, such as behavioral modification and pelvic floor physical therapy, especially as initial treatment options. As the condition worsens however, bulking agents and surgical procedures are often the most widely used treatments.

About Enobosarm and SUI

Enobosarm (GTx-024), a selective androgen receptor modulator (SARM), has been evaluated in 27 completed or ongoing clinical trials enrolling over 2,200 subjects, in which approximately 1,500 subjects were treated with enobosarm at doses ranging from 0.1 mg to 100 mg. At all evaluated dose levels, enobosarm was observed to be generally safe and well tolerated. The rationale for evaluating enobosarm as a treatment for SUI is supported by preclinical in vivo data demonstrating increases in pelvic floor muscle mass following treatment with GTx’s SARM compounds, including enobosarm, and the proof-of-concept Phase 2 clinical trial of enobosarm 3 mg for the treatment of postmenopausal women with SUI.

About GTx

GTx, Inc., headquartered in Memphis, Tenn., is a biopharmaceutical company dedicated to the discovery, development and commercialization of small molecules for the treatment of muscle-related diseases and other serious medical conditions.

Forward-Looking Information is Subject to Risk and Uncertainty

This 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 ongoing clinical development of its selective androgen receptor degrader (SARD) compounds. 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 additional clinical development of GTx’s SARD compounds for the treatment of castration-resistant prostate cancer (CRPC) will be required beyond the ongoing study; and (ii) any future development of SARDs in CRPC is contingent on obtaining sufficient additional capital to permit such development, which it may be unable to do. GTx will continue to need additional funding and may be unable to raise capital when needed, which would force GTx to delay, reduce or eliminate its product candidate development programs and potentially cease operations. 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. You should not place undue reliance on these forward-looking statements, which apply only as of the date of this press release. GTx’s quarterly report on Form 10-Q for the period ended June 30, 2018, 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.

GTx, Inc.Investor Contact:Argot PartnersKimberly Minarovich or Sam Martin, 212-600-1902orMedia Contact:Red House ConsultingDenise Powell, 510-703-9491

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