Study Data on Zadaxin and Interferon

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SciClone Pharmaceuticals, Inc. announced today that a new intent-to-treat meta-analysis of three clinical trials indicates that combination therapy with ZADAXIN thymosin alpha 1 and interferon produced a higher end of treatment response in hepatitis C patients than interferon alone.

SAN MATEO, Calif., Dec. 23, 1998 /PRNewswire/ -- SciClone Pharmaceuticals, Inc. announced today that a new intent-to-treat meta-analysis of three clinical trials indicates that combination therapy with ZADAXIN thymosin alpha 1 and interferon produced a higher end of treatment response in hepatitis C patients than interferon alone. Kenneth Sherman, M.D., Ph.D., Associate Professor of Medicine and Director of Clinical Trials -- Liver Unit of the University of Cincinnati Medical Center, presented the meta-analysis at the 2nd International Conference on Therapies for Viral Hepatitis in Hawaii.

The meta-analysis combined data from three clinical trials involving a total of 121 patients, including difficult to treat patients such as cirrhotics and interferon failures. The patients were given either interferon in combination with thymosin alpha 1 (n=67) or interferon alone (n=54). The intent-to-treat meta-analysis revealed an end of treatment response, defined as normalization of ALT (a measurement of liver inflammation), of 44.7% among patients receiving the combination regimen and 22.2% among patients receiving interferon alone (p=0.0096). Sustained response occurred in 15/67 (22.3%) of thymosin alpha 1/interferon treated patients and only 5/54 (9.26%) of those patients treated with interferon alone (p=0.1). The meta-analysis also demonstrated that patients who received the combination regimen did not experience increased or new side effects compared to side effects related to interferon alone.

``ZADAXIN appears to enhance significantly the activity of interferon in treating hepatitis C,'' Dr. Sherman commented. ``By combining the two drugs, we may be able to improve treatment efficacy without increasing adverse effects associated with interferon monotherapy. Pivotal combination studies are clearly warranted,'' he added.

``These data confirm earlier study results and illustrate that ZADAXIN is an important new treatment for hepatitis C,'' stated Alfred Rudolph, M.D., SciClone's Chief Operating Officer. ``Clinical data continue to confirm that ZADAXIN is an effective therapy for viral hepatitis with a unique safety profile.''

ZADAXIN is an immunomodulator approved and marketed for treatment of chronic hepatitis B in the People's Republic of China, the Republic of the Philippines and Singapore. SciClone has filed for approval to market ZADAXIN for this indication in 16 additional countries.

The World Health Organization and the Centers for Disease Control and Prevention estimate that over 100 million people worldwide are infected with the chronic hepatitis C virus. In the United States alone, over 4 million people are infected with the virus, and there are over 170,000 new cases per year.

SciClone Pharmaceuticals, Inc. is an international biopharmaceutical company that acquires, develops and commercializes specialist-oriented drugs for treating chronic and life-threatening diseases for which there are no adequate treatment modalities, including hepatitis B, hepatitis C, cancer, immune system disorders, and cystic fibrosis. The company's second lead product candidate, CPX, is in a phase I/II trial for cystic fibrosis.

Press releases and corporate information from SciClone Pharmaceuticals, Inc. are available on the Internet at www.sciclone.com and by fax at 800-996-7256.

The statements made in this press release contain certain forward-looking statements that involve a number of risks and uncertainties, including, without limitation, those associated with the initiation and success of phase III clinical trials. Actual events or results may differ from the Company's expectations and beliefs. Factors which may affect the actual results achieved by the Company include future actions by the FDA, or equivalent regulatory authorities in foreign countries, results of pending or future ZADAXIN clinical trials, as well as risk factors listed from time to time in SciClone's SEC filings and reports, including, but not limited to, its Annual Report on Form 10-K.

SOURCE: SciClone Pharmaceuticals, Inc.


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