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ViroPharma Receives Complete Response Letter for Cinryze™ (C1 Esterase Inhibitor [Human]) Industrial Scale Supplement

EXTON, Pa., Oct. 22 /PRNewswire-FirstCall/ -- ViroPharma Incorporated (Nasdaq: VPHM) today announced the U.S. Food and Drug Administration (FDA) issued a complete response letter regarding Cinryze™ (C1 Esterase Inhibitor [Human]) industrial scale manufacturing expansion activities. The FDA has requested additional information related to observations from the pre-approval inspection and review of the technical processes.  

"We and our partner Sanquin will begin working immediately to respond to the FDA as expeditiously as possible," said Vincent Milano, ViroPharma's president and chief executive officer.  "And, we plan to commence manufacturing industrial scale lots at risk in the first quarter of 2011."  

Continued Milano, "We remain committed to provide patients with an uninterrupted supply of Cinryze.  In addition to our efforts around our industrial scale, we expect our currently approved manufacturing process alone will yield up to 60,000 doses annually."

Conference Call and Webcast

ViroPharma is hosting a brief live teleconference and webcast with senior management on October 22, 2010 at 11:00 a.m. Eastern. To participate in the conference call, please dial (888) 299-4099 (domestic) and (302) 709-8337 (international).  After placing the call, please tell the operator you wish to join the ViroPharma investor conference call.  

Alternatively, the live webcast of the conference call can be accessed via ViroPharma's website at  Windows Media or Real Player will be needed to access the webcast.  An audio archive will be available at the same address until November 5, 2010.

About Cinryze™ (C1 esterase inhibitor [human])

Cinryze is a highly purified, pasteurized and nanofiltered plasma-derived C1 esterase inhibitor product that has been approved by U.S. FDA for routine prophylaxis against angioedema attacks in adolescent and adult patients with HAE. C1 inhibitor therapy has been used acutely for more than 35 years in Europe to treat patients with C1 inhibitor deficiency. Cinryze is not currently approved in the European Union or any of its member states.

The most common adverse reactions observed in clinical trials have been upper respiratory infection, sinusitis, rash and headache. No drug-related serious adverse events (SAEs) have been observed in clinical trials. Severe hypersensitivity reactions may occur. Thrombotic events have occurred in patients receiving high dose off-label C1 inhibitor therapy well above the approved treatment dosage regimen. With any blood or plasma derived product, there may be a risk of transmission of infectious agents, e.g. viruses and, theoretically, the CJD agent. The risk has been reduced by screening patients for prior exposure to certain virus infections and by manufacturing steps to reduce the risk of viral transmission including pasteurization and nanofiltration.

Cinryze is for intravenous use only. A dose of 1000 Units of Cinryze can be administered every 3 or 4 days for routine prophylaxis against angioedema attacks in HAE patients. Cinryze is administered at an injection rate of 1 mL per minute.

About Hereditary Angioedema (HAE)

HAE is a rare, severely debilitating, life-threatening genetic disorder caused by a deficiency of C1 inhibitor, a human plasma protein. This condition is the result of a defect in the gene controlling the synthesis of C1 inhibitor. C1 inhibitor maintains the natural regulation of the contact, complement, and fibrinolytic systems, that when left unregulated, can initiate or perpetuate an attack by consuming the already low levels of endogenous C1 inhibitor in HAE patients. Patients with C1 inhibitor deficiency experience recurrent, unpredictable, debilitating, and potentially life threatening attacks of inflammation affecting the larynx, abdomen, face, extremities and urogenital tract. Patients with HAE experience approximately 20 to 100 days of incapacitation per year. There are estimated to be at least 6,500 people with HAE in the United States.

For more information on HAE, visit the U.S. HAE Association's website at:

About ViroPharma Incorporated

ViroPharma Incorporated is an international biopharmaceutical company committed to developing and commercializing innovative products for physician specialists to enable the support of patients with serious diseases for which there is an unmet medical need, and providing rewarding careers to employees.  ViroPharma commercializes Cinryze™ (C1 esterase inhibitor [human]) for routine prophylaxis against angioedema attacks in adolescent and adult patients with hereditary angioedema (HAE).  ViroPharma commercializes Vancocin®, approved for oral administration for treatment of antibiotic-associated pseudomembranous colitis caused by Clostridium difficile and enterocolitis caused by Staphylococcus aureus, including methicillin-resistant strains (for prescribing information on ViroPharma's commercial products, please download the package inserts at  ViroPharma currently focuses its drug development activities in diseases including C1 esterase inhibitor deficiency and C. difficile infection.

ViroPharma routinely posts information, including press releases, which may be important to investors in the investor relations and media sections of our company's web site, The company encourages investors to consult these sections for more information on ViroPharma and our business.

Forward-Looking Statements

Certain statements in this press release contain forward-looking statements that involve a number of risks and uncertainties. Forward-looking statements provide our current expectations or forecasts of future events, and include without limitation statements related to our belief that the industrial scale data meet the FDA's required equivalence criteria; the timing and outcomes of FDA review of the data; when product produced by the industrial scale manufacturing process may be commercially available; our ability to manufacture industrial scale product at risk; the volume of product we can manufacture at the existing scale; our ability to meet projected demand growth for Cinryze; and our ability to ensure that patients will have access to Cinryze. Biologics such as Cinryze require processing steps that are more difficult than those required for most chemical pharmaceuticals, and as such we cannot assure you that the industrial scale process will be considered by the FDA to be equivalent to our existing manufacturing process. The FDA may view the data regarding equivalence of the industrial scale manufacturing process as insufficient or inconclusive, request additional data, require additional conformance batches, delay any decision past the time frames anticipated by us, or deny the approval of the industrial scale manufacturing process. If the manufacturing capacity expansion projects at Sanquin are delayed, or do not result in the capacity we anticipate, if Sanquin cannot obtain necessary regulatory approvals for the contemplated facility expansions in the time frames we anticipate, if we are unable to manufacture industrial scale material at risk or if we are not able to manufacture the anticipated volume of product at the existing scale, we may not be able to satisfy patient demand. Our inability to obtain adequate product supplies to satisfy our patient demand may create opportunities for our competitors and we will suffer a loss of potential future revenues. These factors, and other factors, including, but not limited to those described in our annual report on Form 10-K for the year ended December 31, 2009 and Form 10-Q for the periods ended March 31, 2010 and June 30, 2010 filed with the Securities and Exchange Commission, could cause future results to differ materially from the expectations expressed in this press release. The forward-looking statements contained in this press release are made as of the date hereof and may become outdated over time. ViroPharma does not assume any responsibility for updating any forward-looking statements. These forward looking statements should not be relied upon as representing our assessments as of any date subsequent to the date of this press release.

SOURCE ViroPharma Incorporated
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