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SAN DIEGO, June 20, 2005 - Halozyme Therapeutics, Inc. (AMEX: HTI), a development stage biopharmaceutical company focused on the development and commercialization of recombinant human enzymes, today announced the worldwide market launch of Cumulase  for the treatment of oocytes to facilitate certain in vitro fertilization (IVF) procedures.  The active pharmaceutical ingredient in Cumulase is the first and only recombinant human hyaluronidase approved in the United States and in the European Union (EU) for cumulus removal in the IVF process.  Halozyme received 510(k) clearance from the U.S. Food and Drug Administration (FDA) in April 2005.  Halozyme also received CE Mark approval of Cumulase in December 2004 to market the product throughout the EU.


"We are thrilled to launch our first product and to offer IVF specialists a safer, purer and more reliable alternative to animal-derived extracts," said Jonathan Lim, MD, Halozyme's Chairman and CEO.  "This achievement validates our team's ability to develop and commercialize products based on recombinant human hyaluronidase.  We will market Cumulase throughout the U.S. and the European Union, and in other select countries in Asia."


Cumulase is an ex vivo formulation of rHuPH20 (recombinant human PH20 hyaluronidase) to replace bovine and ovine extracts currently used for the preparation of oocytes prior to IVF during the process of intracytoplasmic sperm injection (ICSI), in which the enzyme is an essential component.  The enzyme removes the hyaluronic acid that surrounds the oocyte, allowing the clinician to then perform ICSI, injecting the sperm into the oocyte.  Cumulase provides the IVF specialist with a safer, purer and more reliable alternative to slaughterhouse-derived extracts.


The total Cumulase market consists of an estimated 500,000 ICSI cycles worldwide in 2005, with nearly 90,000 of those performed in the U.S.  The company has signed agreements with MediCult A/S and MidAtlantic Diagnostics, Inc., to distribute Cumulase worldwide in 1X ready-to-use and 10X concentrate product presentations, respectively.  In February, Halozyme signed a commercial manufacturing supply agreement with Avid Bioservices to manufacture the recombinant human enzyme under current good manufacturing practices (cGMPs). 


About Halozyme Therapeutics, Inc.

Halozyme is a development stage biopharmaceutical company dedicated to developing and commercializing recombinant human enzymes for the infertility, ophthalmology, and oncology communities. The company's portfolio of products under development is based on intellectual property covering the family of human enzymes known as hyaluronidases. Halozyme's recombinant human enzymes may replace current animal slaughterhouse-derived enzymes that carry potential risks of animal pathogen transmission and immunogenicity. The versatility of the first enzyme, rHuPH20, enables Halozyme to develop the product as a medical device, drug enhancement agent, and therapeutic biologic.


Safe Harbor Statement

In addition to historical information, the statements set forth above include forward-looking statements (including, without limitation, statements concerning the marketing of Cumulase) that involve risk and uncertainties that could cause actual results to differ materially from those in the forward-looking statements. The forward-looking statements are also identified through use of the words "believe," "enable," "may," "will," "could," "intends," "estimate," "anticipate," "plan," "predict," "probable," "potential," "possible," "should," "continue," and other words of similar meaning.  Actual results could differ materially from the expectations contained in forward-looking statements as a result of several factors, including regulatory approval requirements and competitive conditions.  These and other factors that may result in differences are discussed in greater detail in the company's reports on Forms 10-KSB, 10-QSB and other filings with the Securities and Exchange Commission.





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