Compare Ceftazidime-Avibactam + Metronidazole Versus Meropenem for Hospitalized Adults With Complicated Intra-Abdominal Infections

Phase 3

Completed

Conditions: Complicated Intra-Abdominal Infection

Interventions: Drug: Meropenem
Drug: CAZ-AVI
Drug: Metronidazole

Registration Number: NCT01499290

Lead Sponsor: Pfizer

Brief Summary: The purpose of this study is to evaluate the effects of Ceftazidime Avibactam plus Metronidazole compared to Meropenem for treating hospitalized patients with complicated intra-abdominal infections.

Detailed Description: A Phase III, Randomized, Multicenter, Double Blind, Double-Dummy, Parallel-Group, Comparative Study to Determine the Efficacy, Safety, and Tolerability of Ceftazidime Avibactam Plus Metronidazole Versus Meropenem in the Treatment of Complicated Intra-Abdominal Infections In Hospitalized Adults

Recruitment & Eligibility

Status: COMPLETED

Sex: All

Target Recruitment: 493

Inclusion Criteria

18 to 90 years of age inclusive
Female patient is authorized to participate if at least one of the following criteria are met:
1. Surgical sterilization
2. Age ≥50 years and postmenopausal as defined by amenorrhea for 12 months or more following cessation of all exogenous hormonal treatments
3. Age <50 years and postmenopausal as defined by documented LH and FSH levels in the postmenopausal range PLUS amenorrhea for 12 months or more following cessation of all exogenous hormonal treatments
4. Patient has a negative serum pregnancy test (serum ß-human chorionic gonadotropin [ß-hCG]) within 1 day prior to study entry, and agrees to use highly effective contraception methods during treatment and for at least 7 days after last dose of IV study therapy
Intraoperative/postoperative enrollment with confirmation (presence of pus within the abdominal cavity) of an intra-abdominal infection associated with peritonitis
Confirmation of infection by surgical intervention within 24 hours of entry: evidence of systemic inflammatory response; physical findings consistent with intra-abdominal infection; supportive radiologic imaging findings of intra-abdominal infections

Exclusion Criteria

Patient is diagnosed with traumatic bowel perforation undergoing surgery within 12 hours; perforation of gastroduodenal ulcers undergoing surgery within 24 hours. Other intra-abdominal processes in which primary etiology is not likely to be infectious
Patient has abdominal wall abscess or bowel obstruction without perforation or ischemic bowel without perforation
Patient has suspected intra-abdominal infections due to fungus, parasites, virus or tuberculosis
Patient is considered unlikely to survive the 6 to 8 week study period or has a rapidly progressive or terminal illness, including septic shock that is associated with a high risk of mortality

Study & Design

Study Type: INTERVENTIONAL

Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Meropenem	Meropenem	IV treatment
CAZ-AVI + Metronidazole	CAZ-AVI	IV treatment
CAZ-AVI + Metronidazole	Metronidazole	IV treatment

Primary Outcome Measures

Name	Time	Method
Clinical Response at the Test of Cure (TOC) Visit in the Microbiologically Modified Intent-To-Treat (mMITT) Analysis Set (Primary Outcome for FDA).	TOC: 28 to 35 days after start of study drug	The number of patients meeting the cure criteria: complete resolution or significant improvement of signs and symptoms of the index infection such that no further antibacterial therapy, drainage, or surgical intervention is necessary. Indeterminate response are where study data were not available for evaluation of efficacy for any reason, including patient lost to follow-up or assessment not undertaken such that a determination of clinical response could not be made, death where cIAI was clearly noncontributory or circumstances that precluded classification as a cure or failure. Results from two identical protocols D4280C00001 and D4280C00005 combined into a single database with agreement from FDA and EMA.
Clinical Response at the TOC Visit in the Modified Intent-To-Treat Analysis Set (Co-primary Outcome for Rest of World [ROW]).	TOC: 28 to 35 days after start of study drug	The number of patients meeting the cure criteria: complete resolution or significant improvement of signs and symptoms of the index infection such that no further antibacterial therapy, drainage, or surgical intervention was necessary. Indeterminate response are where study data were not available for evaluation of efficacy for any reason, including patient lost to follow-up or assessment not undertaken such that a determination of clinical response could not be made, dDeath where cIAI was clearly noncontributory or circumstances that precluded classification as a cure or failure.
Clinical Response at the TOC Visit in the Clinically Evaulable (CE) Analysis Set (Co-primary Outcome for Rest of World [ROW]).	TOC: 28 to 35 days after start of study drug	The number of patients meeting the cure criteria: complete resolution or significant improvement of signs and symptoms of the index infection such that no further antibacterial therapy, drainage, or surgical intervention was necessary.

Secondary Outcome Measures

Name	Time	Method
Clinical Cure at TOC in the Microbiologically Evaluable Analysis Set	TOC: 28 to 35 days after start of study drug	The number of patients meeting the cure criteria: complete resolution or significant improvement of signs and symptoms of the index infection such that no further antibacterial therapy, drainage, or surgical intervention was necessary.
Clinical Cure at TOC in the Extended Microbiologically Evaluable Analysis Set	TOC: 28 to 35 days after start of study drug	The number of patients meeting the cure criteria: complete resolution or significant improvement of signs and symptoms of the index infection such that no further antibacterial therapy, drainage, or surgical intervention was necessary.
Per-pathogen Microbiological Response at TOC in the Microbiologically Modified Intent-To-Treat Analysis Set.	TOC: 28 to 35 days after start of study drug.	The number of patients with a favorable per-pathogen microbiological response: favourable microbiological response includes: Eradication Absence of causative pathogen from specimens at the site of infection. Presumed eradication where, repeat cultures were not performed/clinically indicated in a patient who had a clinical response of cure.
Clinical Response by Visit in the Primary Population: Microbiologically Modified Intent-to-Treat (mMITT)	EOT: within 24 hours after last dose of study drug. TOC: 28 to 35 days after start of study drug. LFU: 42 to 49 days after start of study drug	Complete resolution or significant improvement of signs and symptoms of the index infection such that no further antibacterial therapy, drainage, or surgical intervention was necessary. Indeterminate response are where study data were not available for evaluation of efficacy for any reason, including patient lost to follow-up or assessment not undertaken such that a determination of clinical response could not be made, dDeath where cIAI was clearly noncontributory or circumstances that precluded classification as a cure or failure.
Number of Patients Afebrile at Last Observation in the Clinically Evaluable Analysis Set for Patients Who Have Fever at Study Entry	Test of Cure: 1 to 14 days after start of study drug	Time to first defervescence was calculated for patients with a fever (\>38ºC) at baseline. Defervescence (≤37.8ºC) was defined as the absence of fever based on the highest temperature recorded on each study day.
Per-patient Microbiological Response in the Microbiologically Modified Intent- To-Treat Analysis Set	EOT: within 24 hours after last dose of study drug. TOC: 28 to 35 days after start of study drug. LFU 42 to 49 days after start of study drug	Microbiological responses as per the protocoled criteria: responses other than "indeterminate" were classified as "favorable" or "unfavorable." Favorable microbiological response assessments included "eradication" and "presumed eradication." Unfavorable microbiological response assessments included "persistence," "persistence with increasing minimum inhibitory concentration (MIC)," and "presumed persistence." Indeterminate microbiologic response assessments included cases where the clinical response was changed to indeterminate due to a surgical review panel (SRP) assessment of inadequate source control (ie, circumstances that preclude classification as eradication, presumed eradication, persistence, persistence with increasing MIC, and presumed persistence).
Per-patient Microbiological Response at TOC for Patients Infected With Ceftazidime-resistant Pathogens in mMITT Analysis Set	Test of Cure: 28 to 35 days after start of study drug	Microbiological responses other than "indeterminate" were classified as "favorable" or "unfavorable." Favorable microbiological response assessments included "eradication" and "presumed eradication." Unfavorable microbiological response assessments included "persistence," "persistence with increasing minimum inhibitory concentration (MIC)," and "presumed persistence." Indeterminate microbiologic response assessments included cases where the clinical response was changed to indeterminate due to an SRP assessment of inadequate source control (ie, circumstances that preclude classification as eradication, presumed eradication, persistence, persistence with increasing MIC, and presumed persistence).
Clinical Response by Pathogen at TOC for Patients Infected With Ceftazidime-resistant Pathogens in Microbiological Modified Intent to Treat Analysis Set	Test of Cure: 28 to 35 days after start of study drug	Complete resolution or significant improvement of signs and symptoms of the index infection such that no further antibacterial therapy, drainage, or surgical intervention was necessary.
Favorable Per-pathogen Microbiological Response for Patients Infected With Ceftazidime-resistant Pathogens in mMITT Analysis Set	TOC: 28 to 35 days after start of study drug	The number of patients with a favorable per-pathogen microbiological response: favourable microbiological response includes: Eradication Absence of causative pathogen from specimens at the site of infection. Presumed eradication where, repeat cultures were not performed/clinically indicated in a patient who had a clinical response of cure.
Plasma Concentrations for Ceftazidime and Avibactam	Anytime within 15 minutes prior to or after stopping study drug, anytime between 30 and 90 minutes after stopping study drug, anytime between 300 minutes and 360 minutes after stopping study drug	Blood samples were taken from all patients on Day 3 for the pharmacokinetic evaluation of ceftazidime and avibactam plasma concentrations