$TTPH Tetraphase Announces Top-Line Results From IGNITE2 Phase 3

WATERTOWN, Mass., Sept. 8, 2015 (GLOBE NEWSWIRE) — Tetraphase Pharmaceuticals, Inc.(TTPH), a clinical stage biopharmaceutical company developing novel antibiotics to treat life-threatening multidrug-resistant (MDR) infections, today announced that the IGNITE2 phase 3 clinical trial of eravacycline administered as an IV to oral transition therapy for the treatment of complicated urinary tract infections (cUTI) did not achieve its primary endpoint of statistical non-inferiority compared to levofloxacin.

“We are disappointed that the IGNITE2 trial did not achieve its primary endpoint. We plan to further analyze the data and provide an update after we have discussed the data and our plans for a path forward with the regulatory agencies,” said Guy Macdonald, President and CEO of Tetraphase. “We previously announced positive data from the IGNITE1 phase 3 clinical trial of eravacycline administered intravenously in complicated intra-abdominal infections which did meet its primary endpoint, demonstrating high cure rates in prevalent Gram-negative pathogens and a favorable safety profile.”

Macdonald added, “We continue to believe that eravacycline can benefit patients with serious infections, particularly those caused by difficult-to-treat Gram-negative bacteria.”

The pivotal portion of the phase 3 IGNITE2 clinical trial enrolled 908 patients who were randomized 1:1 to receive eravacycline (1.5 mg/kg intravenously every 24 hours followed by 200 mg orally every 12 hours) or levofloxacin (750 mg intravenously every 24 hours followed by 750 mg orally every 24 hours). Each patient received a minimum of 3 days of IV dosing and then, if clinically indicated, were eligible to transition to oral therapy for the remaining doses for a total treatment period of 7 days. For the U.S. Food and Drug Administration (FDA), the primary analysis evaluated the responder outcome (a combination of clinical cure rate and microbiological response) in the Microbiological Intent-to-Treat (micro-ITT) population at the Post-Treatment (PT) visit (defined as 6-8 days after the completion of therapy) using a 10% non-inferiority margin. For the European Medicines Agency (EMA), the primary analysis evaluated the microbiological response in the microbiologically modified ITT (micro-MITT) population and microbiologically evaluable (ME) populations at the PT visit using a 10% non-inferiority margin. Eravacycline did not achieve the primary endpoint under either analysis.