Halozyme Therapeutics, Inc. Completes Enrollment Of Chemophase Phase I Clinical Trial For Superficial Bladder Cancer

SAN DIEGO, March 6 /PRNewswire-FirstCall/ -- Halozyme Therapeutics, Inc. , a biopharmaceutical company developing and commercializing recombinant human enzymes, announced today it has completed patient enrollment for its Chemophase(TM) Phase I clinical trial. Chemophase is a novel investigational recombinant therapeutic being developed to enhance the delivery of chemotherapy.

The initial clinical protocol for Chemophase was designed to evaluate a single intravesical (into the bladder) administration of Chemophase along with the widely used anticancer drug mitomycin in patients with superficial bladder cancer. The Phase I study enrolled five patients with superficial bladder cancer. The objectives of the study were to determine the safety, tolerability and pharmacokinetics of Chemophase administered intravesically with mitomycin. The study was conducted at BCG Oncology in Phoenix, Arizona under the supervision of Donald L. Lamm, MD, the principal investigator.

According to data from the American Cancer Society, National Cancer Institute, American Urological Association, and Southwest Oncology Group Study, more than 100,000 patients have new or recurrent superficial bladder cancer in the U.S. every year. All of these patients may be potential candidates for Chemophase in the event it is approved as first-line treatment with mitomycin.

About Halozyme Therapeutics, Inc.

Halozyme is a biopharmaceutical company developing and commercializing recombinant human enzymes for the infertility, palliative care, and oncology markets. The company’s portfolio of products 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 extracts that carry potential risks of animal pathogen transmission and immunogenicity. The company has received FDA approval for two products: Cumulase(TM), the first and only recombinant human hyaluronidase for cumulus removal in the IVF process; and Hylenex(TM), for use as an adjuvant to increase the absorption and dispersion of other injected drugs. The versatility of the first enzyme, rHuPH20, enables Halozyme to develop the product as a medical device, drug enhancement agent, and therapeutic drug.

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Halozyme Contact David A. Ramsay Chief Financial Officer (858) 794-8889 dramsay@halozyme.com Investor Relations Contacts Zachary Bryant Lippert/Heilshorn & Associates (310) 691-7100 zbryant@lhai.com Media Contacts Kathy Sweeney / Joleen Schultz Mentus (858) 455-5500, x230/x215 kwitz@mentus.comjschultz@mentus.com

Halozyme Therapeutics, Inc.

CONTACT: David A. Ramsay, Chief Financial Officer of HalozymeTherapeutics, Inc., +1-858-794-8889, dramsay@halozyme.com; or InvestorRelations, Zachary Bryant of Lippert/Heilshorn & Associates,+1-310-691-7100, zbryant@lhai.com, for Halozyme Therapeutics, Inc.; orMedia, Kathy Sweeney, ext. 230, kwitz@mentus.com, or Joleen Schultz, ext.215, jschultz@mentus.com, both of Mentus, +1-858-455-5500, for HalozymeTherapeutics, Inc.

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