Hyperion Therapeutics Raises $60 Million

Hyperion Therapeutics, a San Francisco-based drug company focused on gastroenterology and hepatology, has raised $60 million in Series C funding. Bay City Capital and Panorama Capital co-led the round, and were joined by return backers Highland Capital Partners, New Enterprise Associates and Sofinnova Ventures.

PRESS RELEASE

Hyperion Therapeutics, a privately held specialty pharmaceutical company focused on the development of therapies that address critical unmet needs in the areas of gastroenterology and hepatology, today announced it has closed a $60 million Series C financing. New investors Bay City Capital and Panorama Capital co-led the financing. Series A and B investors Highland Capital Partners, NEA, and Sofinnova Ventures also participated.

The Series C financing follows the Company’s recent announcement of Phase II results and orphan drug designation for HPN-100 in its lead indication, the chronic treatment of patients with urea cycle disorders (UCD). The capital will fund the Phase III clinical program for UCD as well as a Phase II study in low grade hepatic encephalopathy.

Concurrent with the Series C financing, H. Daniel Perez, M.D. of Bay City Capital, and Gaurav Aggarwal, M.D. of Panorama Capital have joined the Hyperion Therapeutics Board of Directors.

“Considerable unmet needs remain in the treatment of both urea cycle disorders and hepatic encephalopathy,” said Daniel Perez of Bay City Capital. “We believe the Hyperion management team, with their extensive drug development and regulatory expertise, is well positioned to lead a clinical development program focused on potential treatment options for these patients.”

About HPN-100

HPN-100 is an investigational product that is a pre-pro-drug of phenylacetic acid, the active moiety of BUPHENYL(R), the only therapy currently FDA-approved as adjunctive therapy for the chronic management of patients with the most prevalent urea cycle disorders: carbamylphosphate synthetase (CPS), ornithine transcarbamylase (OTC), and argininosuccinic acid synthetase (AS) deficiencies. HPN-100, which is dosed orally in liquid form, is under clinical investigation as providing a potential alternative pathway to the urea cycle for the disposal of ammonia through the renal excretion of phenylacetylglutamine, which is formed from phenylacetic acid and glutamine.

About Urea Cycle Disorders

Urea cycle disorders are inherited, inborn errors of metabolism present in an estimated 1 in 10,000 births in the United States. Patients with urea cycle disorders are deficient in one of the key enzymes that comprise the urea cycle, the body’s primary vehicle for removing ammonia, a potent neurotoxin, from the bloodstream. Onset may occur at any age depending on the severity of the disorder. Left untreated, urea cycle disorders can cause dangerously heightened levels of ammonia in the bloodstream (hyperammonemia) resulting in brain damage, coma, and/or death.

About Hepatic Encephalopathy

Hepatic encephalopathy (HE) is a serious but potentially reversible neurological disorder that can occur in patients with acute liver failure and, most commonly, in patients with cirrhosis of any etiology. It comprises a spectrum of neurological signs and symptoms ranging from mild (e.g. minimal disorientation) to severe (e.g. coma, death) and is believed to occur when the brain is exposed to gut-derived toxins such as ammonia that are normally removed from the blood by a healthy liver. There are no therapies currently FDA-approved for the treatment of HE.

About BUPHENYL

BUPHENYL is indicated as adjunctive therapy in the chronic management of patients with urea cycle disorders involving deficiencies of carbamylphosphate synthetase (CPS), ornithine transcarbamylase (OTC), or argininosuccinic acid synthetase (AS). BUPHENYL should not be administered to patients with known hypersensitivity to sodium phenylbutyrate or any component of this preparation. The most common adverse reactions associated with BUPHENYL were amenorrhea dysfunction, decreased appetite, body odor (probably caused by its metabolite phenylacetate) and bad taste or taste aversion. Patients with urea cycle disorders should not take valproic acid, haloperidol, or steroids as these drugs have been reported to increase blood ammonia levels, and probenecid may affect the kidneys’ excretion. Use with great care, if at all, in patients with congestive heart failure or severe renal insufficiency, and in clinical states where there is sodium retention with edema. Use caution when administering to patients with hepatic or renal insufficiency or inborn errors of beta oxidation. The safety or efficacy of doses in excess of 20 grams (40 tablets) per day has not been established.

About Hyperion Therapeutics

Hyperion Therapeutics is a privately held specialty therapeutics company focused on the development of therapies that address critical unmet needs in the areas of gastroenterology and hepatology. Hyperion and Ucyclyd Pharma, Inc., a subsidiary of Medicis Pharmaceutical Corporation, entered into a collaboration agreement for HPN-100 in August 2007. Under the terms of the agreement, Hyperion is conducting ongoing research and development of HPN-100 for urea cycle disorders, hepatic encephalopathy, and other forms of hyperammonemia. Hyperion is headquartered in South San Francisco, CA. For additional information, visit www.hyperiontx.com.

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