Aeglea BioTherapeutics to Present Pegzilarginase Phase 1 Dose Escalation Data in Patients with Advanced Solid Tumors at 2018 AACR Annual Meeting

AUSTIN, Texas, April 05, 2018 (GLOBE NEWSWIRE) -- Aeglea BioTherapeutics, Inc. AGLE, a clinical-stage biotechnology company that designs and develops innovative human enzyme therapeutics for patients with rare genetic diseases and cancer, today announced that it will present Phase 1 dose escalation data regarding the use of the Company's pegzilarginase in patients with advanced solid tumors at the 2018 Annual Meeting of the American Association for Cancer Research (AACR) in Chicago, Illinois on Sunday, April 15.

Title: Phase I Dose Escalation Trial of Pegzilarginase in Patients with Advanced Solid Tumors

Session Title: Phase I Clinical Trials 1

Session Date and Time: Sunday, April 15, 1:00 p.m. to 5:00 p.m. CT

Session Location: McCormick Place South, Hall A, Poster Section 42

Poster Board Number: 23

Permanent Abstract Number: CT030

An electronic version of the presentation will be available for download from the Presentations & Events section of the Company's investor relations website after the poster presentation.

About Pegzilarginase (AEB1102) in Cancer

Pegzilarginase is an enhanced human arginase that enzymatically degrades the amino acid arginine. In some cancers, tumor cells stop producing specific amino acids and must acquire them from the blood, making the tumor cells susceptible to starvation through depletion of those amino acids. Aeglea is developing pegzilarginase to exploit vulnerabilities in some cancers that lead to an increased dependency on extracellular arginine. Pegzilarginase targets these arginine dependent cancers by depleting blood arginine levels to below the normal range. Preclinical data demonstrated that the resulting arginine starvation inhibits proliferation, induces cell death, increases turnover of cell components and promotes anti-tumor immune responses. The Company's Phase 1 data in advanced solid tumors demonstrated that pegzilarginase was well tolerated at doses that produced marked and sustained reductions in blood arginine levels below the normal range.

About Aeglea BioTherapeutics

Aeglea is a clinical-stage biotechnology company that designs and develops innovative human enzyme therapeutics for patients with rare genetic diseases and cancer. The Company is developing pegzilarginase, its lead investigational therapy, for the treatment of Arginase 1 Deficiency, as monotherapy in arginine-dependent cancers and in combination with an immune checkpoint inhibitor for small cell lung cancer. In addition, Aeglea has an active research pipeline of other human enzyme-based approaches in both therapeutic areas. For more information, please visit http://aegleabio.com.

Media Contact:

David Calusdian

Sharon Merrill Associates

617.542.5300

AGLE@investorrelations.com

Investor Contact:

Charles N. York II

Chief Financial Officer

Aeglea BioTherapeutics

investors@aegleabio.com