ViroPharma Receives Complete Response Letter for Cinryze(TM) Supplemental Biologics License Application for Acute Treatment of Hereditary ...( - Company Also Granted Expansion of P...)

- Company Also Granted Expansion of Prophylaxis Therapy Label to Include Patient Labeling for Self-Administration -

EXTON, Pa., June 4 /PRNewswire-FirstCall/ -- ViroPharma Incorporated (Nasdaq: VPHM) today announced that it has received a Complete Response letter from the U.S. Food and Drug Administration (FDA) related to its supplemental Biologics License Application (sBLA) for Cinryze(TM) (C1 esterase inhibitor [human]) as a treatment for acute attacks of hereditary angioedema (HAE). The FDA has requested an additional clinical study, due to their opinion that the placebo controlled study submitted in support of the sBLA lacked robustness. In the Complete Response letter, the FDA cited no safety concerns related to acute treatment with Cinryze in the clinical studies.

In addition, ViroPharma announced that FDA has approved the patient labeling for Cinryze to include self-administration for routine prophylaxis, once patients are properly trained by their healthcare provider.

"Though Cinryze is already successfully preventing attacks of HAE in many patients, there remains an unmet medical need for patients suffering from acute laryngeal attacks," said Vincent Milano, ViroPharma's president and chief executive officer. "Despite having a statistically significant result using the most conservative intent-to-treat (ITT) analysis, the FDA feels that the data are not robust enough to support approval at this time. We intend to respond to the FDA about our plans, and we will provide an update on the second quarter financial call."

In October 2008, Cinryze was approved as the first and only targeted therapy for routine prophylaxis against angioedema attacks. In clinical studies and in commercial use, Cinryze has been generally well-tolerated. In the controlled clinical trials of Cinryze, there we
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