Characterization of Baseline Pathogens and Microbiological Eradication in a Phase 2 trial for Treatment of Complicated Intra-abdominal Infections Comparing Eravacycline (TP-434) to Ertapenem 1 C. Fyfe a , J. Deane b , T. Grossman a , P. Horn a , G. Moore a , D. Sahm b , J. Studeny a , S. Walpole a , and J. Sutcliffe a a Tetraphase Pharmaceuticals, Inc. (Watertown, MA, USA) and b Eurofins Medinet Global Central Laboratory (Chantilly, VA, USA)
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Characterization of Baseline Pathogens and Microbiological
Eradication in a Phase 2 trial for Treatment of Complicated
Multidrug resistance was seen, including 15.8% of Enterobacteriaceae (n=18/114) with resistance to ≥3 antibiotic classes, 15 of which were ESBL-producers.
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Resistancesa Number of Enterobacteriaceae
Isolates (n = 23) with Phenotype
Number of Gram-Negative Non-
Fermenters (n=14) with Phenotype NONE 3
TET LEV 1
CEF LEV 3
GEN LEV 1
ERT CEF 1
TET CEF LEV 3
TET GEN LEV 1
CEF PTZ LEV 3
ERT CEF LEV 1
ERT TET CEF 3
TET GEN CEF LEV 3
TET CEF PTZ LEV 3
TET GEN CEF PTZ LEV 2
ERT GEN CEF PTZ LEV 2
ERT TET GEN CEF LEV 2
ERT TET CEF PTZ LEV 2
ERT TET GEN CEF PTZ LEV 1 2
a TET = tetracycline; LEV = levofloxacin; CEF = either ceftazidime or cefotaxime; ERT = ertapenem; PTZ = piperacillin/tazobactam; GEN = gentamicin
APRIL 2013
Eravacycline Covers the Toughest Gram-Negative Aerobes,
Including ESBL+ Pathogens
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Pathogen(s) Presumed Eradicated No.
A. baumannii 2
E. coli 13
K. pneumoniae 1
MDR phenotypes include combinations of ESBL(s), FQR, TetR, ErtaR, Pip/Tazo-R
Cures Only in Combined Eravacycline Cohorts in ME Population
Eravacycline
ErtapenemCeftazidime
TetracyclineLevofloxacin
GentamicinPiperacillin/Tazobactam
0
2
4
6
8
10
12
14
16
Nu
mb
er
of
Iso
late
s
MIC (μg/ml)
APRIL 2013
Data from Phase 2 cIAI, on file, Tetraphase Pharmaceuticals, Inc.
Isolates in the ME Population at the TOC that are
ESBL-positive ± Carbapenem-Resistant
SEPTEMBER 2012 CONFIDENTIAL 13
24% (31/129) of the isolates of the gram-negative aerobes in the ME
population ) had ESBLs/carbapenemases
22 ESBL/carbapenem genes/gene families were screened by PCR and
confirmed by gene sequencing
Isolates were found to have one or more ESBLs or carbapenemases
– Class A enzymes: CTXM
– Class B enzymes: NDM-1, NDM-4
– Class C enzymes: CMY, ADC
– Class D enzymes: OXA, AIM
Favorable Clinical/Microbiological Responses (n/N*) at the TOC in Patients from the ME Population with Drug Resistance (ESBL-positive ± Carbapenem-Resistant)
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Pathogen
Eravacycline (1.5mg/kg q24h)
X=10**
Eravacycline (1.0mg/kg q12h)
X=10
Ertapenem (1.0 g q24h)
X=4
A. baumannii 1/1 1/1 2/2
E. coli 5/6 6/6 1/1
K. pneumoniae 0/1 1/1 -
Pantoea spp. - - 1/1
P. aeruginosa 3/4 1/1 -
S. maltophilia - 1/1 -
*n/N = Favorable clinical response/No. patients with pathogen **X = Total number of patients; some patients had greater than one ESBL pathogen
APRIL 2013
Eravacycline: Profile of a Well-Differentiated
Antibiotic
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Feature
Broad Spectrum Antibiotic
- covers Gram –ve, Gram +ve, anaerobes and atypicals
- active against difficult-to-treat MDR Gram –ve pathogens