LEXICON PHARMACEUTICALS ANNOUNCES ADDITIONAL DATA ON TELOTRISTAT ETHYL’S ANTIPROLIFERATIVE EFFECTS IN PATIENTS WITH CARCINOID SYNDROME

THE WOODLANDS, Texas, March 13, 2020 (GLOBE NEWSWIRE) -- (Nasdaq: LXRX), announced today additional data on XERMELO’s^® (telotristat ethyl) antiproliferative effects in patients with carcinoid syndrome that were presented at the European Neuroendocrine Tumor Society (ENETS) meeting (March 11-13). XERMELO is approved for the treatment of carcinoid syndrome diarrhea in combination with somatostatin analog (SSA) therapy in adults inadequately controlled by SSA therapy, but is not currently approved for any other use.

Data from a retrospective, pre- and post-design chart review of 200 metastatic neuroendocrine tumor patients who were on standard background therapies and received telotristat ethyl for an average of 12 months in US clinical practice demonstrated that most patients had no tumor progression at 6, 12 and 18 months following initiation of telotristat ethyl, with a median time to tumor progression (TTP) of 39.8 months. The majority of patients also experienced progression-free survival (PFS) in the post-telotristat ethyl period, with a median PFS of 23.7 months. In addition, in a subset of 22 patients with recorded biomarker data, mean serotonin levels decreased significantly in the post-telotristat ethyl period. Patients also improved on carcinoid syndrome (CS) symptoms, body weight and performance status.

“We are pleased this observational study showed that use of telotristat ethyl was associated with not only neuroendocrine tumor control but also meaningful improvements in CS symptoms and clinical indicators of overall health in patients with advanced neuroendocrine tumors and carcinoid syndrome,” said Pablo Lapuerta, executive vice president and chief medical officer of Lexicon. “Results of this observational study coupled with preclinical data support the conduct of clinical trials to examine telotristat ethyl’s effect on neuroendocrine tumors.”

About XERMELO (telotristat ethyl)

Discovered using Lexicon’s unique approach to gene science, XERMELO is the first and only approved oral therapy for carcinoid syndrome diarrhea. XERMELO targets tryptophan hydroxylase, an enzyme that mediates the excess serotonin production within metastatic neuroendocrine tumor (mNET) cells. XERMELO is approved in the United States, the European Union and certain additional countries for the treatment of carcinoid syndrome diarrhea in combination with SSA therapy in adults inadequately controlled by SSA therapy. Carcinoid syndrome is a rare condition that occurs in patients living with mNETs and is characterized by frequent and debilitating diarrhea. XERMELO targets the overproduction of serotonin inside mNET cells, providing an additional treatment option for patients suffering from carcinoid syndrome diarrhea.

Lexicon has granted Ipsen an exclusive royalty-bearing right and license to commercialize XERMELO outside of the United States and Japan. Lexicon is commercializing XERMELO in the United States and Ipsen is commercializing XERMELO in multiple countries, including the United Kingdom and Germany.

XERMELO (telotristat ethyl) Important Safety Information

• Warnings and Precautions: XERMELO may cause constipation, which can be serious. Monitor for signs and symptoms of constipation and/or severe, persistent, or worsening abdominal pain in patients taking XERMELO. Discontinue XERMELO if severe constipation or severe, persistent, or worsening abdominal pain develops.
• Adverse Reactions: The most common adverse reactions (≥5%) include nausea, headache, increased gamma-glutamyl-transferase, depression, flatulence, decreased appetite, peripheral edema, and pyrexia.
• Drug Interactions: If necessary, consider increasing the dose of concomitant CYP3A4 substrates, as XERMELO may decrease their systemic exposure. If combination treatment with XERMELO and short-acting octreotide is needed, administer short-acting octreotide at least 30 minutes after administering XERMELO.

For more information about XERMELO, see Full Prescribing Information at .

About Lexicon Pharmaceuticals

Lexicon is a fully integrated biopharmaceutical company with a mission of pioneering medicines that transform patients’ lives. Through its Genome5000™ program, Lexicon scientists studied the role and function of nearly 5,000 genes and identified more than 100 protein targets with significant therapeutic potential in a range of diseases. Through the precise targeting of these proteins, Lexicon is pioneering the discovery and development of innovative medicines to safely and effectively treat disease. In addition to its first commercial product, XERMELO, Lexicon has a pipeline of promising drug candidates in clinical and preclinical development in diabetes and metabolism, oncology and neuropathic pain. For additional information, please visit .

Safe Harbor Statement

This press release contains “forward-looking statements,” including statements relating to Lexicon’s long-term outlook on its business, including the clinical development of, the regulatory filings for, and the potential therapeutic and commercial potential of XERMELO (telotristat ethyl). In addition, this press release also contains forward looking statements relating to Lexicon’s growth and future operating results, discovery, development and commercialization 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 Lexicon’s ability to meet its capital requirements, successfully commercialize XERMELO, successfully conduct preclinical and clinical development and obtain necessary regulatory approvals of telotristat ethyl, sotagliflozin, LX9211 and its other potential drug candidates on its anticipated timelines, 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. Any of these risks, uncertainties and other factors 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, 2019, 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.

For Investor Inquiries:

Kimberly Lee, D.O.

Head of Investor Relations and Corporate Strategy

Lexicon Pharmaceuticals

(281) 863-3383

For Media Inquiries:

Chas Schultz

Executive Director, Corporate Communications and Patient Advocacy

Lexicon Pharmaceuticals

(281) 863-3421