Lexicon Pharmaceuticals Completes Enrollment in Pivotal Phase 3 Clinical Trial of Telotristat Etiprate

Top-Line Results Expected in the 3rd Quarter of 2015

The Woodlands, Texas, March 9, 2015 - Lexicon Pharmaceuticals, Inc. (Nasdaq: LXRX), a biopharmaceutical company focused on developing breakthrough treatments for human disease, today announced that it has completed enrollment in TELESTAR, its pivotal Phase 3 clinical trial of telotristat etiprate for patients with carcinoid syndrome.  The company expects to announce top-line data from the TELESTAR trial in the third quarter of 2015.

"The effects of carcinoid syndrome are severely debilitating for many people's lives, causing them to suffer from life-altering diarrhea, flushing and pain," said Lonnel Coats, Lexicon's president and chief executive officer. "Completing enrollment in this pivotal Phase 3 clinical trial marks an important step in bringing telotristat etiprate to market to help improve the lives of these individuals whose carcinoid syndrome is no longer adequately controlled by somatostatin analog treatment."

TELESTAR is Lexicon's pivotal Phase 3 clinical trial of telotristat etiprate evaluating the safety and tolerability of telotristat etiprate and its effect on symptoms associated with carcinoid syndrome.  In total, the trial enrolled 135 patients with inadequately controlled carcinoid syndrome on background somatostatin analog therapy, in a randomized, double-blind, placebo-controlled study of 250mg three times daily and 500mg three times daily doses of telotristat etiprate over a 12-week treatment period, followed by a 36-week, open-label extension where all patients receive 500mg three times daily doses of telotristat etiprate.  The primary efficacy endpoint under evaluation in the trial is the number of daily bowel movements, with secondary efficacy endpoints including changes in urinary 5-HIAA levels, flushing episodes, abdominal pain and quality of life measures.


About Lexicon
Lexicon is a biopharmaceutical company focused on developing breakthrough treatments for human disease.  Lexicon has clinical-stage drug programs for diabetes, carcinoid syndrome, and other indications, all of which were discovered by Lexicon's research team.  Lexicon has used its proprietary gene knockout technology to identify more than 100 promising drug targets.  For additional information about Lexicon and its programs, please visit www.lexpharma.com.

Safe Harbor Statement
This press release contains "forward-looking statements," including statements relating to Lexicon's clinical development of telotristat etiprate (LX1032), including characterizations of the results of and projected timing of clinical trials and the potential therapeutic and commercial potential of telotristat etiprate.  In addition, this press release also contains forward-looking statements relating to Lexicon's growth and future operating results, discovery and development of products, strategic alliances and intellectual property, as well as other matters that are not historical facts or information.  All forward-looking statements are based on management's current assumptions and expectations and involve risks, uncertainties and other important factors, specifically including those relating to Lexicon's ability to meet its capital requirements, successfully conduct clinical development of telotristat etiprate and preclinical and clinical development of its other potential drug candidates, obtain necessary regulatory approvals, achieve its operational objectives, obtain patent protection for its discoveries and establish strategic alliances, as well as additional factors relating to manufacturing, intellectual property rights, and the therapeutic or commercial value of its drug candidates, that may cause Lexicon's actual results to be materially different from any future results expressed or implied by such forward-looking statements.  Information identifying such important factors is contained under "Risk Factors" in Lexicon's annual report on Form 10-K for the year ended December 31, 2013, as filed with the Securities and Exchange Commission.  Lexicon undertakes no obligation to update or revise any such forward-looking statements, whether as a result of new information, future events or otherwise.

distributed by