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Merrimack Pharmaceuticals Announces MM-398 Achieves Primary Endpoint Of Overall Survival In Phase 3 Trial In Post-Gemcitabine Metastatic Pancreatic Cancer

MM-398 in combination with 5-fluorouracil and leucovorin demonstrates statistically significant advantage compared to control arm Plan to submit New Drug Application in 2014 Conference Call Scheduled for 8:30 a.m. ET Today

CAMBRIDGE, Mass., May 1, 2014 (GLOBE NEWSWIRE) -- Merrimack Pharmaceuticals, Inc. (Nasdaq:MACK) today announced that the combination of MM-398 with 5-fluorouracil (5-FU) and leucovorin achieved an overall survival of 6.1 months, a 1.9 month improvement over the 4.2 month survival demonstrated by the control arm of 5-FU and leucovorin alone. The NAPOLI-1 Phase 3 study was conducted in patients with metastatic pancreatic cancer who previously received gemcitabine-based therapy. The primary log-rank analysis of overall survival was statistically significant (p=0.012) with a corresponding hazard ratio of 0.67. A statistically significant advantage for progression free survival was also observed in the combination arm.  

The most common Grade 3 or higher adverse events in the combination arm were neutropenia (14.5%), fatigue (13.7%), diarrhea (12.8%) and vomiting (11.1%). Sepsis (3.4%) was the only serious life threatening event that occurred with a more than 2% difference between the combination arm and the control arm.    

"We are excited by the results of the NAPOLI-1 study because of the critical need to help patients with this devastating illness and are moving forward as quickly as possible to get MM-398 to patients," said Robert Mulroy, President and CEO of Merrimack. "Given that there have only been a handful of successful Phase 3 trials in pancreatic cancer in the past 25 years, it is gratifying to have the first positive Phase 3 trial in the post-gemcitabine setting. The results reinforce our confidence in our entire nanoliposomal pipeline. We are grateful for the dedication of the investigators, the research community and, most importantly, the patients and their families who bravely participated in this study."

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