Healthcare Industry News:  C1 inhibitor 

Biopharmaceuticals FDA

 News Release - May 6, 2008

Lev Pharmaceuticals Announces Cinryze(TM) Complete Response Submission Accepted for Review by FDA

NEW YORK--(HSMN NewsFeed)--Lev Pharmaceuticals, Inc. (OTCBB: LEVP.OB ) today announced that the U.S. Food and Drug Administration (FDA) has accepted for review Lev’s complete response submission for Cinryze™ (C1 inhibitor), the Company’s lead product candidate. Lev is seeking marketing approval for Cinryze™ for both the acute and prophylactic treatment of hereditary angioedema (HAE), also known as C1 inhibitor deficiency.

In addition, the FDA has designated Lev's complete response as a Class 2 resubmission, establishing an October 14, 2008 target action date to complete its review of the biologics license application (BLA) for Cinryze™. Lev submitted its complete response to FDA on April 14, 2008.

“As expected, the FDA has determined our response to be a Class 2 resubmission, and we look forward to further advancing our application through the FDA’s review process,” said Joshua Schein, chief executive officer of Lev.

The FDA issued a complete response letter (or “approvable” letter) on January 30, 2008 requesting information with respect to chemistry, manufacturing, and controls (CMC), as well as additional analyses of existing efficacy data from the Cinryze™ trials. No additional safety information and no additional clinical trials have been requested to date.

On May 2, 2008, the Blood Products Advisory Committee (BPAC) to the FDA voted unanimously that there is sufficient evidence of the safety and efficacy for the approval of Cinryze™ (C1 inhibitor) for the prophylactic treatment of HAE. The data from Lev’s acute treatment trial was not presented before the BPAC and is currently under active review at FDA.

About Cinryze™

Cinryze™ is a plasma-derived C1 inhibitor product that has been studied for the prophylactic and acute treatment of HAE. C1 inhibitor has been used for more than 35 years in Europe to treat patients with C1 inhibitor deficiency.

In the Phase III prophylactic treatment trial, Cinryze™ decreased the normalized number of HAE attacks compared to placebo. The trial had a crossover design with 22 subjects in the efficacy data set. The difference between the number of angioedema attacks during treatment with Cinryze™ and the number during treatment with placebo was statistically significant (p<0.0001). During 12 weeks of prophylactic treatment with Cinryze™, the number of attacks per patient ranged from 0 to 17.6 with a mean of 6.3 (±5.5) and a median of 6 attacks. During 12 weeks of treatment with placebo, the number of attacks per patient ranged from 6 to 20.5 with a mean of 12.7 (± 4.6) and a median of 13.5 attacks. The clinically and statistically significant results for the primary endpoint demonstrating the efficacy of Cinryze™ were supported by statistically significant and clinically meaningful differences in all of the secondary endpoints, with Cinryze™ demonstrating reductions in the severity and duration of attacks, number of days of swelling, and need for open-label Cinryze™ rescue therapy. In the Phase III acute treatment trial, the median time to the onset of unequivocal relief of symptoms for an acute attack was significantly different between the Cinryze™ group (2 hr) and placebo group (> 4 hr) (p=0.026).

Additionally, Cinryze™ has been well tolerated with an adverse event profile no different from placebo. The most common adverse reactions observed have been upper respiratory infection and sinusitis. No drug-related serious adverse events, no immunogenicity and no decrease in efficacy have been observed.

As part of Lev's CHANGE trials (C1 inhibitor in Hereditary Angioedema Nanofiltration Generation evaluating Efficacy), the Company is conducting two open label studies for the treatment and prevention of HAE. Qualifying HAE patients continue to have access to Cinryze™ on a compassionate use basis, free of charge. To date, more than 6,000 doses of Cinryze™ have been administered in all parts of the CHANGE trials with more than a dozen patients having individually received well over 100 doses.

About Hereditary Angioedema

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 unrestricted, 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. While there is no approved therapy for acute HAE attacks in the U.S., C1 inhibitor has been used in Europe to treat HAE for more than 35 years. There are estimated to be 10,000 people with HAE in the U.S.

Additional information on HAE can be obtained from the U.S. Hereditary Angioedema Association at

About Lev Pharmaceuticals, Inc.

Lev is a biopharmaceutical company focused on developing and commercializing therapeutic products for the treatment of inflammatory diseases. Lev’s lead product candidate, Cinryze™ (C1 inhibitor), is being developed as a replacement therapy for both the acute and prophylactic treatment of hereditary angioedema (HAE), also known as C1 inhibitor deficiency. Cinryze™ has been granted orphan drug status for the acute and prophylactic treatment of HAE, potentially securing, upon approval, market exclusivity for seven years. Additionally, Lev is in the process of prioritizing its C1 inhibitor development platform for the treatment of selective other diseases and disorders in which inflammation is known or believed to play an underlying role.

For more information about Lev, C1 inhibitor, or HAE, please contact Lev directly at 212-682-3096, or visit Lev’s website at

Forward Looking Statements

This press release contains forward-looking statements that involve substantial risks and uncertainties. All statements, other than statements of historical facts, included in this press release regarding our plans and objectives of management are forward-looking statements. We may not actually achieve the plans, intentions or expectations disclosed in our forward-looking statements and you should not place undue reliance on our forward-looking statements. Actual results or events could differ materially from the plans, intentions and expectations disclosed in the forward-looking statements we make. Various important factors could cause actual results or events to differ materially from the forward-looking statements that we make, including risks related to new information arising out of clinical trial results, the risk that the safety and/or efficacy results of existing clinical trials for Cinryze™ will not support approval for a biologics license, the risk that FDA may require us to conduct additional clinical trials for Cinryze™, the risk that FDA may interpret data differently than we do or require more data or a more rigorous analysis of data than expected, the risk that FDA will not approve a product for which a biologics license has been applied, our heavy dependence on the success of Cinryze™, our dependence on our suppliers, our dependence on third parties to manufacture Cinryze™, obtaining regulatory approval to market Cinryze™, market acceptance of Cinryze™, maintaining the orphan drug status associated with Cinryze™, the risks associated with dependence upon key personnel, and our ability to obtain additional funding to support our business activities. These and other risks are described in greater detail in the "Risk Factors that May Affect Results" section of our filings with the SEC. Our forward-looking statements do not reflect the potential impact of any future acquisitions, mergers, dispositions, joint ventures or investments we may make. We do not assume any obligation to update any forward-looking statements.

Source: Lev Pharmaceuticals

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