RegeneRx Phase 2 AMI Trial on Clinical Hold Due to GMP Compliance Issues at Contract Manufacturer

March 16, 2011 - Rockville, Md

RegeneRx Biopharmaceuticals, Inc. (OTC Bulletin Board: RGRX) ("the Company" or "RegeneRx") announced that it has received a notice from the U.S. Food and Drug Administration (FDA) indicating that, due to non-compliance with FDA's current Good Manufacturing Practice (cGMP) regulations by its contract manufacturer, the Company's Phase 2 clinical trial of RGN-352, its injectable formulation of Thymosin beta 4 for the treatment of acute myocardial infarction (AMI), has been placed on clinical hold. RegeneRx is currently unable to estimate the length of time that the trial will be on clinical hold. The Company was scheduled to begin enrolling patients in the trial in the coming weeks. The Company will provide additional information as it becomes available.

The clinical hold is limited to cGMP compliance issues at a specific contract manufacturing site and is not directed at the safety of RGN-352, the Company's Phase 2 AMI protocol or its clinical development plan, nor does it affect any other RegeneRx clinical trial or drug candidate.

About RegeneRx Biopharmaceuticals, Inc.

RegeneRx is focused on the development of a novel therapeutic peptide, Thymosin beta 4, or Tβ4, for tissue and organ protection, repair and regeneration. RegeneRx currently has three drug candidates in clinical development and has an extensive worldwide patent portfolio covering its products.

RGN-352 is an injectable formulation to treat cardiovascular and central nervous system diseases, as well as other medical indications. RegeneRx has successfully completed a Phase 1 clinical trial with RGN-352 in which the drug candidate was found to be safe and well-tolerated. The company has initiated a Phase 2 clinical trial at approximately 20 clinical sites in the U.S., Israel, and Russia, although this trial is currently on an FDA-imposed clinical hold. RegeneRx recently received a $3 million, three-year development grant from the NIH to support the company's acute myocardial infarction program.

RGN-259 is a sterile, preservative-free topical eye drop for ophthalmic indications. Based on recent human clinical data, RegeneRx is currently supporting a physician-sponsored Phase 2 dry eye study with RGN-259. Previously, seven patients with non-healing corneal ulcers were treated with RGN-259 under compassionate use INDs. Five had complete healing and two had substantial healing of their wounds. Three additional patients with corneal defects, called punctate keratitis, had no evidence of healing although they did report reduction in eye inflammation and increased comfort.

RGN-137, a topical gel formulation, is currently being evaluated by RegeneRx in a Phase 2 clinical trial for the treatment of the orphan skin disease epidermolysis bullosa. Other potential uses for RGN-137 include the treatment of chronic dermal wounds and reduction of scar tissue.

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