( CAMBRIDGE Mass.--(BUSINESS WIRE)--Apr ...)DX-88 for Hereditary Angioedema Meets Primary and Secondary,Endpoints in Phase 3 Trial (EDEMA3),Health

CAMBRIDGE, Mass.--(BUSINESS WIRE)--Apr 12, 2007 - Dyax Corp. (Nasdaq:DYAX) announced today positive topline results from its Phase 3, placebo-controlled trial, EDEMA3, for its lead product candidate DX-88 (ecallantide), for hereditary angioedema (HAE). A webcast presentation of the EDEMA3 data is scheduled for Tuesday, April 17, 2007 at 12:30 p.m. ET.

DX-88, an internally discovered, recombinant, plasma kallikrein inhibitor, is in clinical trials for the treatment of acute attacks of HAE, a rare genetic disease characterized by episodes of acute swelling and inflammation. Statistically significant results (DX-88-treated patients versus placebo) were achieved for both the primary and secondary endpoints in the EDEMA3 trial.

The primary endpoint, symptom improvement at four hours measured by a Treatment Outcome Score (TOS) developed for HAE attacks, had a p-value of 0.021. The two secondary endpoints also demonstrated statistical significance. The patient reported assessment of individual symptom burden at four hours measured using the Mean Symptom Complex Severity score (MSCS) had a p-value of 0.024. Time to significant improvement in overall response (defined for this trial as the first time post dosing that the patient reported the symptom complex as "a lot better" or "resolved" within the first 4 hours) had a median time of 149 minutes for the DX-88 group versus greater than 4 hours for the placebo group (p=0.044). The overall safety results showed that DX-88 continues to be well tolerated. There were no drug-related serious adverse events. EDEMA3 is the largest successfully completed, placebo-controlled trial for this indication under a United States Investigational New Drug application.

"We are extremely excited about the outcome of this EDEMA3 trial," commented Henry E. Blair, Chairman and Chief Executive Officer of Dyax. "Based on the topline results of this study, the extensive clinical dat
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