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Halozyme Therapeutics Presents Pre-Clinical Studies on Dermal Remodeling With HTI-501, a Lysosomal Proteinase

- New Molecular Entity Targeting Structural Proteins in the Matrix -

SAN DIEGO, May 19, 2008 /PRNewswire-FirstCall/ -- Halozyme Therapeutics, Inc. , a biopharmaceutical company developing and commercializing products targeting the extracellular matrix ("Matrix"), today announced the presentation of new pre-clinical findings on the controlled modification of the Matrix with HTI-501 at the European Society for Dermatological Research (ESDR) and Japanese Society for Investigative Dermatology (JSID).

HTI-501 is a new recombinant human lysosomal proteinase under development at Halozyme that could provide an effective dermatologic treatment by targeting and degrading the fibrous components of the Matrix in a highly controlled fashion. This Matrix targeting new molecular entity is being explored as a potential solution for therapeutic, as well as aesthetic, dermatology indications for which surgery may be impractical, such as cellulite and certain forms of scarring.

HTI-501 works by a process called enzymatic subscision, which involves degradation of fibrous septae (or cords) in a controllable and predictable manner to release skin tissue from the fibrous cords and smooth out the surface contour, which could be especially beneficial in aesthetic dermatology indications. Other proteinases such as collagenases are not generally feasible therapies for aesthetic dermatology, due to their persistent degradation of surrounding tissue that may create safety concerns or require use of sub-potent dosing regimens. As a strictly pH-dependent enzyme, HTI-501 may be capable of exerting its activity in a tightly regulated fashion.

    Key findings were as follows:

    -- HTI-501 was identified as a member of the lysosomal proteinase family

       capable of degrading insoluble collagen in vitro at pH 5-6, but

       catalytically inactive at physiologic pH of 7.4.


    -- By injection of pH indicators of increasing buffer strength, the study

       established that temporal-spatial pH control of the extracellular

       environment from 1-20 minutes post injection could be achieved.


    -- The efficacy of HTI-501 on fibrous septae in rodent and porcine models

       was established by release of hydroxyl-proline and histologic

       evaluation in comparison with bacterial collagenase.


    -- HTI-501 administration resulted in significant hydroxyproline release

       at pH 5 compared to bacterial collagenase, but not at pH 7.4.

       Importantly, skin interstitial pH returned to neutrality within 20

       minutes of the administration of HTI-501.


"Due to strict pH dependence for enzyme activity, lysosomal proteinases have been largely neglected as potential therapeutic proteins due to their inability to digest proteins outside the lysosomal compartment in the cell," said Gilbert Keller, PhD, Halozyme's Technical Leader in Dermatology. "By bringing this intracellular environment to the extracellular matrix in a temporal fashion, our platform for controlled modulation of the dermal matrix may provide a novel mechanism for tightly controlled pharmacologic subscision of collagenous interstitial matrix. Additional pre-clinical studies are continuing on our lead candidate, HTI-501."

About Halozyme Therapeutics, Inc.

Halozyme is a biopharmaceutical company developing and commercializing products targeting the extracellular matrix for the drug delivery, oncology and dermatology markets. The company's portfolio of products and product candidates is based on intellectual property covering the family of human enzymes known as hyaluronidases. The company's Enhanze(TM) Technology is a novel drug delivery platform designed to increase the absorption and dispersion of biologics. Its key partnerships are with Roche to apply Enhanze Technology to Roche's biological therapeutic compounds for up to 13 targets and with Baxter to apply Enhanze Technology to Baxter's biological therapeutic compound, GAMMAGARD LIQUID 10%. In addition, the company has received FDA approval for two products: Cumulase(R), for use in in-vitro fertilization, and HYLENEX, for use as an adjuvant to increase the absorption and dispersion of other injected drugs and fluids. HYLENEX is partnered with Baxter International Inc. The Company also has a number of different enzymes in its portfolio that are targeting significant areas of unmet need.

Safe Harbor Statement

In addition to historical information, the statements set forth above include forward-looking statements (including, without limitation, statements concerning the pre-clinical results of the company's HTI-501 enzyme program) 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-K, 10-Q, and other filings with the Securities and Exchange Commission.

     Halozyme Contact                      Media Contacts

     Robert H. Uhl                         Karen Sparks / Joleen Schultz

     Senior Director, Investor Relations   Mentus

     (858) 704-8264                        (858) 455-5500, x275/x215

     ruhl@halozyme.com                     karen@mentus.com

                                           jschultz@mentus.com

CONTACT: Robert H. Uhl, Senior Director, Investor Relations of HalozymeTherapeutics, Inc., +1-858-704-8264, ; or media, KarenSparks, +1-858-455-5500, ext. 275, , or Joleen Schultz,+1-858-455-5500, ext. 215, , both of Mentus for HalozymeTherapeutics, Inc. ruhl@halozyme.com karen@mentus.com jschultz@mentus.com

Web site: http://www.halozyme.com//

Ticker Symbol: (NASDAQ-NMS:HALO)

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Posted: May 2008

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