We are developing our lead product candidate, eravacycline, as a broad-spectrum intravenous and oral antibiotic for the treatment of multidrug-resistant (MDR) infections, including those caused by MDR Gram-negative bacteria. We are currently investigating the safety and efficacy of eravacycline in a Phase 3 program called IGNITE (Investigating Gram-negative Infections Treated with Eravacycline) for the treatment of complicated intra-abdominal infections (cIAI)(IGNITE 1), and complicated urinary tract infections (cUTI)(IGNITE 2). We reported top-line data from IGNITE 1 in December 2014 and expect top-line data for from IGNITE 2 in the third quarter of 2015. We target a U.S. regulatory submission for eravacycline for both indications by the end of 2015.

Eravacycline has been designated by the FDA as a Qualified Infectious Disease Product, or QIDP, for both the cIAI and cUTI indications. The QIDP designation makes eravacycline eligible for priority review and an additional five years of U.S. market exclusivity, if approved. In April 2014, the FDA granted Fast Track designations for both the cIAI and cUTI indications and the IV and oral formulations of eravacycline. Fast Track designation is awarded to expedite the study and regulatory review of drugs intended to treat serious or life-threatening conditions that demonstrate the potential to address unmet medical needs.

Eravacycline is a novel, fully synthetic tetracycline antibiotic. We selected eravacycline for development from tetracycline derivatives that we generated using our proprietary chemistry technology on the basis of the following characteristics of the compound that we observed in in vitro studies of the compound:

  • potent antibacterial activity against a broad spectrum of susceptible and multi-drug resistant bacteria, including Gram-negative, Gram-positive, atypical and anaerobic bacteria;
  • potential to treat the majority of patients as a first-line empiric monotherapy with convenient dosing; and
  • potential for intravenous-to-oral transition therapy.

In in vitro studies, eravacycline has been highly active against emerging MDR pathogens like Acinetobacter baumannii as well as clinically important species of Enterobacteriaceae, including those isolates that produce ESBLs or that are resistant to the carbapenem class of antibiotics, and anaerobes.

Based on in vitro studies we have completed, eravacycline shares a similar potency profile with carbapenems except that it more broadly covers Gram-positive pathogens like MRSA and enterococci, is active against carbapenem-resistant Gram-negative bacteria and unlike carbapenems like Primaxin and Merrem is not active against Pseudomanas aeruginosa. Eravacycline has demonstrated strong activity in vitro against Gram-positive pathogens, including both nosocomial and community-acquired methicillin susceptible or resistant Staphylococcus aureus strains, vancomycin susceptible or resistant Enterococcus faecium and Enterococcus faecalis, and penicillin susceptible or resistant strains of Streptococcus pneumoniae. In in vitro studies for cIAI, eravacycline consistently exhibited strong activity against enterococci and streptococci. One of the most frequently isolated anaerobic pathogens in cIAI, either as the sole pathogen or often in conjunction with another Gram-negative bacterium, is Bacteroides fragilis. In these studies eravacycline demonstrated activity against Bacteroides fragilis and a wide range of Gram-positive and Gram-negative anaerobes.

Key Differentiating Attributes of Eravacycline
The following key attributes of eravacycline, observed in clinical trials and preclinical studies of eravacycline, differentiate eravacycline from other antibiotics targeting MDR infections. 

  • Broad-spectrum activity against a wide variety of multi-drug resistant Gram-negative, Gram-positive and anaerobic bacteria. In our Phase 2 clinical trial of the intravenous formulation of eravacycline, eravacycline demonstrated a high cure rate against a wide variety of multi-drug resistant Gram-negative, Gram-positive and anaerobic bacteria. In addition, in in vitro studies eravacycline demonstrated potent antibacterial activity against Gram-negative bacteria, including E. coli; ESBL-producing Klebsiella pneumoniae; Acinetobacter baumannii; Gram-positive bacteria, including MSRA and vancomycin-resistant enterococcus, or VRE; and anaerobic pathogens. As a result of this broad-spectrum coverage, eravacycline has the potential to be used as a first-line empiric monotherapy for the treatment of cIAI, cUTI, hospital-acquired bacterial pneumonias and other serious and life-threatening infections.
  • Favorable safety and tolerability profile. Eravacycline has been evaluated in more than 800 subjects in the Phase 1, Phase 2 and Phase 3 clinical trials that we have conducted. In these trials, eravacycline has demonstrated a favorable safety and tolerability profile. In our Phase 2 and Phase 3 clinical trials of eravacycline in patients with cIAI, no patients suffered any drug-related serious adverse events, and safety and tolerability were comparable to ertapenem, the control therapy in the trials. In addition, in these Phase 2 and Phase 3 clinical trials, the rate at which gastrointestinal adverse events such as nausea and emesis that occurred in the eravacycline arms was low.
  • Convenient dosing regimen. In our clinical trials to date, we have dosed eravacycline once or twice a day as a monotherapy. We believe that eravacycline will be able to be administered as a first-line empiric monotherapy with once- or twice-daily dosing, avoiding the need for complicated dosing regimens typical of multi-drug cocktails and the increased risk of negative drug-drug interactions inherent to multi-drug cocktails.
  • Potential for convenient intravenous-to-oral transition therapy. In addition to the IV formulation of eravacycline, we have developed an oral formulation of eravacycline that we are evaluating in IGNITE 2. If successful, this oral formulation would enable patients who begin IV treatment with eravacycline in the hospital setting to transition to oral dosing of eravacycline either in hospital or upon patient discharge for convenient home-based care. We believe that the availability of both IV and oral transition therapy may reduce the length of a patient’s hospital stay and the overall cost of care.

Additionally, in February 2012, Tetraphase announced a contract award from the Biomedical Advanced Research and Development Authority (BARDA) worth up to $67 million for the development of eravacycline, from which Tetraphase may receive up to approximately $40 million in funding. The contract includes pre-clinical efficacy and toxicology studies; clinical studies; manufacturing activities; and associated regulatory activities to position the broad-spectrum antibiotic eravacycline as a potential empiric countermeasure for the treatment of inhalational disease caused by Bacillus anthracis, Francisella tularensis and Yersinia pestis. The funding under the BARDA Contract is also being used for certain activities in the development of eravacycline to treat certain infections caused by life-threatening multidrug-resistant bacteria.


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