Efficacy and Safety of Colistimethate Sodium for Injection in The Treatment of Carbapenem-Resistant Enterobacteriaceae Infection

Colistimethate Sodium for Injection in The Treatment of Carbapenem-Resistant Enterobacteriaceae Infection：a Prospective, Open-label, Randomized Controlled, Multicenter Clinical Trial

Colistin can be used to treat the infection caused by carbapenem-resistant enterobacteriaceae(CRE). In China, patients diagnosed with Hospital-acquired-pneumonia (HAP)or bloodstream infection caused by CRE are recruited, and randomly assigned to two groups, and in one group the patients accept treatment with colistin, however in another group, the patients accept treatment without colistin. The efficacy and safety of the treatment between the two groups are compared.

Study Overview

• Status: Recruiting
• Conditions: Carbapenem-Resistant Enterobacteriaceae Infection
• Intervention / Treatment: Drug: treatment with or without colistin

Detailed Description

The study will be conducted in accordance with good clinical practice and with the guidelines set out in the Declaration of Helsinki. After approval from local and national ethics committees, patients diagnosed with Hospital-acquired-pneumonia (HAP)or bloodstream infection caused by CRE from 14 centres in China will be recruited. All patients will be randomized to receive treatment with or without colistin in the ICU. The purpose of this study is to investigate the efficacy and safety of colistin when used to treat patients with CRE infection. The primary outcome is 14-day all cause mortality and the second outcomes include 14-day clinical cure rate, 14-day efficacy rate, ICU free days within 28 days after randomization，14-day microbiological cure rate，incidence of adverse events and severe adverse events in first 14 days, hospital mortality, 28-day all cause mortality, ICU mortality. Clopper-Pearson method is used to calculate the 95% confidence interval of mortality, Miettinen and Nurminen method is used to detect the difference between the two groups.

• Study Type: Interventional
• Enrollment (Estimated): 404
• Phase: Not Applicable

Contacts and Locations

• Study Contact: Name: Yingzi Huang, MD; Phone Number: +86-025-83262552; Email: yz_huang@126.com
• Study Contact Backup: Name: Jianfeng Xie, MD; Phone Number: +86-025-83262552; Email: xie820405@126.com

Study Locations

• China
  • Anhui
    • Hefei, Anhui, China, 230000
      • Recruiting
      • Anhui Provincial People's Hospital
      • Contact: Aijun, Pan; Phone Number: +8613866668786
    • Hefei, Anhui, China, 230000
      • Recruiting
      • The First Hospital of Anhui Medical University
      • Contact: Min Shao; Phone Number: +8615656065677
  • Fujian
    • Jinjiang, Fujian, China, 362200
      • Recruiting
      • Jinjiang Municipal Hospitall
      • Contact: Sen Lin; Phone Number: +8618065956302
  • Jiangsu
    • Huai'an, Jiangsu, China, 223000
      • Recruiting
      • Huai'an First People's Hospital
      • Contact: Xiangcheng Zhang; Phone Number: +8615896169171
    • Lianyungang, Jiangsu, China, 222000
      • Recruiting
      • The First Hospital of Lianyungang
      • Contact: Suxia Liu; Phone Number: +8618961326708
    • Nanjing, Jiangsu, China, 210000
      • Recruiting
      • Zhongda Hospital Affiliated to Southeast University
      • Contact: Yingzi Huang; Phone Number: +86-25-83262552; Email: yz_huang@126.com
    • Nantong, Jiangsu, China, 226000
      • Recruiting
      • Affiliated Hospital of Nantong University
      • Contact: Hongsheng Zhao; Phone Number: +8613962918910
    • Suzhou, Jiangsu, China, 215000
      • Recruiting
      • The First Affiliated Hospital of Soochow University
      • Contact: Jun Jin; Phone Number: +8613806214010
    • Suzhou, Jiangsu, China, 215000
      • Recruiting
      • Suzhou Municipal Hospitial
      • Contact: Liu Jun
    • Taizhou, Jiangsu, China, 225300
      • Recruiting
      • JiangsuTaizhou People's Hospital
      • Contact: Jilu Ye; Phone Number: +8613852609309
    • Wuxi, Jiangsu, China, 214000
      • Recruiting
      • Wuxi No.2 People's Hospital
      • Contact: Liang Luo; Phone Number: +8615961790376
    • Xuzhou, Jiangsu, China, 221000
      • Recruiting
      • Xuzhou Central Hospital
      • Contact: Jiaqiong Li; Phone Number: +8618952170393
    • Yancheng, Jiangsu, China, 224000
      • Recruiting
      • YanCheng NO.1 People's Hospital
      • Contact: Genghua Mu; Phone Number: +8613815584925
    • Yangzhou, Jiangsu, China, 225000
      • Recruiting
      • Northern Jiangsu People's Hospital
      • Contact: Ruiqiang Zheng; Phone Number: +8613952721411
    • Yixing, Jiangsu, China, 214000
      • Recruiting
      • Yixing People's Hospital
      • Contact: Junjie Lu; Phone Number: +8613606157979

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult; Older Adult
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

1. Patients who can provide written informed consent or their informed consent can be provided by legal guardian
2. Patients who are hospitalized
3. Adults ≥18 years and ≤85 years of age

4. Patients suspected of or diagnosed with hospital-acquired pneumonia (HAP, in a patient hospitalised for more than 48 hours or developing within 7 days after discharge from a hospital) or bloodstream infection caused carbapenem-resistant enterobacteriaceae (CRE) based on the culture results of the sample collected 5 days before the randomization or rapid diagnostic detection.

   Rapid testing of respiratory or blood specimens should be used to enable early identification of CRE infection pneumonia. Patients can be randomized based on the results of the rapid test while awaiting results of cultures from the local laboratory. However, if the sample does not grow CRE in the local microbiology laboratory culture, these patients will be withdrawn from the study drug treatment.

   Patients with HAP should fulfil one of the following systemic signs: 1)Fever (temperature >38°C) or hypothermia (rectal/core temperature <35°C);2)White blood cell (WBC) count >10,000 cells/mm3, or WBC count <4500 cells/mm3, or >15% band forms and fulfil at least two of the following respiratory signs or symptoms:1)a new onset of cough (or worsening of cough);2)production of purulent sputum or endotracheal secretions;3)auscultatory findings consistent with pneumonia/pulmonary consolidation (e.g., rales, rhonchi, bronchial breath sounds, dullness to percussion, egophony);4)dyspnoea, tachypnoea or hypoxaemia (O2 saturation <90% or pO2 <60 mmHg while breathing room air).

   Patients with bloodstream infection should fulfil one of the following criterion:1)fever(≥38 ℃);2)chills;3)hypotension(systolic <90 mmHg, requiring vasopressors to maintain mean arterial pressure ≥60 mmHg,decreased by 30mmHg from baseline) ,and isolation of CRE from at least two blood culture collected from two different sites.

5. Respiratory or blood specimen obtained for culture within 5 days prior to randomization, and after the onset of signs and symptoms of HAP or bloodstream infection (ideally before receipt of any systemic antibiotics).
6. Patients whose APACHE II score is between 10 and 30.

Exclusion Criteria:

1. Patients who received polymyxin for more than 48 hours in the 72 hours prior to randomization.
2. Patients who received antibiotics more than 24 hours in the 72 hours prior to randomization, and after treatment，conditions of patients improved.
3. Patient with history of serious allergy, hypersensitivity (eg, anaphylaxis), or any serious reaction to Colistimethate Sodium for Injection or other ingredients of it.
4. Evidence of active concurrent pneumonia requiring additional antimicrobials treatment caused by Streptococcus pneumoniae，Haemophilus influenzae，Methicillin-resistant staphylococcus aureus，Vancomycin-resistant enterococcus，Mycoplasma pneumonia，Legionella pneumophila, respiratory syncytial virus, influenza virus, parainfluenza virus, Middle East Respiratory Virus, Mycobacteria, Aspergillus, Mucormycosis, Candida,etc. If these organisms are identified but it is deemed by the Investigator that no treatment is warranted and their presence does not significantly change the prognosis of the patient, then the patient may be considered for this study.
5. Patients who are diagnosed with primary lung cancer (including small cell lung cancer/non-small cell lung cancer patients) or other malignancy transferred to the lungs or other known post obstructive pneumonia. Patients who is known or suspected of active tuberculosis, cystic fibrosis, lung abscess, pyothorax or obstructive pneumonia.
6. Patients with hematological malignancy such as leukemia, lymphoma and multiple myeloma.
7. Patients with lung/heart transplantation or stem cell transplantation.
8. Patient was immunocompromised and at risk of infection by opportunistic pathogens including, but not limited to the following:1) HIV (AIDS or CD4 <200). 2) chemoradiotherapy within 3 months prior to randomisation. 3) Immunosuppressive therapy including maintenance corticosteroids (0.5 mg/kg prednisone per day or other equivalent glucocorticoid). 4) Absolute neutrophil count <500/mm3.
9. Patients with chronic liver failure with portal hypertension, acute hepatic failure or acute decompensation of chronic hepatic failure.
10. Patients who participated in other clinical trials within three months.
11. Patient was pregnant or breastfeeding. If either urine or serum β-hCG test was positive, the patient was excluded.
12. Patient who have been previously enrolled in this study.
13. Patients who have condionts that may affect the trial.
14. Other conditions exist researchers thought are not suitable.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: None (Open Label)

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: colistin group; For patients in this group, colistin based therapy is used. Colistin combined with metroperan or imipenem（MIC≤8mg/L），or colistin combined with tigecycline, or colistin combined with aminoglycosides (amikacin) are suggested to treat patients diagnosed with hospital-acquired pneumonia or bloodstream infection caused by carbapenem-resistant enterobacteriaceae. At the beginning of the intravenous use of Colistimethate Sodium for Injection，the load dose is 300mg CBA(about 9 million U)，and after 12-24 hours，the first maintenance dose should be given. The daily maintenance dose was 300-360mg CBA(9 million-10.9 million U), divided into two times (1/12h), for each time, 0.5-1 hour is needed to complete the infusion. Drug: colistin, other name: Colistimethate Sodium for Injection	Drug: treatment with or without colistin; For patients in this treatment group, colistin based therapy is used. Colistin combined with metroperan or imipenem（MIC≤8mg/L），or colistin combined with tigecycline, or colistin combined with aminoglycosides (amikacin) are suggested to treat patients diagnosed with hospital-acquired pneumonia or bloodstream infection caused by carbapenem-resistant enterobacteriaceae. For patients in the control, best available treatment without colistin is uesed; Ceftazidime-avibactam, tigecycline combined with metroperan or imipenem（MIC≤8mg/L）, tigecycline combined with aminoglycosides (amikacin) are suggested to treat patients diagnosed with hospital-acquired pneumonia or bloodstream infection caused by carbapenem-resistant enterobacteriaceae.
Active Comparator: control group; For patients in this group,best available treatment without colistin is used. Ceftazidime-avibactam, tigecycline combined with metroperan or imipenem（MIC≤8mg/L）, tigecycline combined with aminoglycosides (amikacin) are suggested to treat patients diagnosed with hospital-acquired pneumonia or bloodstream infection caused by carbapenem-resistant enterobacteriaceae.Dose of other drugs are listed below: 1-2g meropenem should be given every 8 hours，1g Imipenem every 8 hours or 6 hours，0.8g Amikacin everyday，2.5g ceftazidime-avibactam every 8 hours. A load dose of 200mg tigecycline is needed, followed by 100mg every 12 hours.	Drug: treatment with or without colistin; For patients in this treatment group, colistin based therapy is used. Colistin combined with metroperan or imipenem（MIC≤8mg/L），or colistin combined with tigecycline, or colistin combined with aminoglycosides (amikacin) are suggested to treat patients diagnosed with hospital-acquired pneumonia or bloodstream infection caused by carbapenem-resistant enterobacteriaceae. For patients in the control, best available treatment without colistin is uesed; Ceftazidime-avibactam, tigecycline combined with metroperan or imipenem（MIC≤8mg/L）, tigecycline combined with aminoglycosides (amikacin) are suggested to treat patients diagnosed with hospital-acquired pneumonia or bloodstream infection caused by carbapenem-resistant enterobacteriaceae.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
14-day all cause mortality	the proportion of subjects who die within 14 days after randomization to the number of subjects in each group	from randomization to day 14

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
14-day clinical cure rate	the proportion of subjects who are thought as clinical effectiveness 14 days after randomization to the number of subjects in each group.	from randomization to day 14
14-day efficacy rate	the proportion of subjects of who are thought as recovery 14 days after randomization to the number of subjects in each group.	from randomization to day 14
ICU free days within 28 days after randomization	days that patients are not treated in ICU within 28 days after randomization of each patient in each group. If the patient die within 28 days, it will be zero.	from randomization to day 28
14-day microbiological cure rate	the proportion of subjects of microbiological cure to the number of subjects in each group 14 days after randomization.	from randomization to day 14
hospital mortality	the proportion of subjects who die when treated in hospital to the number of subjects in each group	to be evaluated up to 90 days post randomization
28-day all cause mortality	the proportion of subjects who die within 28 days after randomization to the number of subjects in each group	from randomization to day 28
ICU mortality	the proportion of subjects who die in ICU to the number of subjects in each group	to be evaluated up to 90 days post randomization
incidence of adverse events and severe adverse events within first 28 days	the proportion of patients who experience adverse events and severe adverse events within 14 days after randomization to the number of subjects in each group wihtin first 14 days	from randomization to day 28

Collaborators and Investigators

• Sponsor: Southeast University, China
• Investigators: Study Chair: Yingzi Huang, MD, Department of Critical Care Medicine, Zhongda Hospital, School of Medicine, Southeast University

Study record dates

Study Major Dates

• Study Start (Actual): November 27, 2023
• Primary Completion (Estimated): December 31, 2025
• Study Completion (Estimated): December 31, 2025

Study Registration Dates

• First Submitted: September 7, 2023
• First Submitted That Met QC Criteria: September 20, 2023
• First Posted (Actual): September 25, 2023

Study Record Updates

• Last Update Posted (Actual): May 18, 2025
• Last Update Submitted That Met QC Criteria: May 14, 2025
• Last Verified: May 1, 2025

More Information

Terms related to this study

• Keywords: Hospital-acquired pneumonia; Bloodstream infection; Carbapenem-resistant Enterobacteriaceae; Colistimethate Sodium for Injection
• Additional Relevant MeSH Terms: Pathologic Processes; Disease Attributes; Bacterial Infections; Bacterial Infections and Mycoses; Gram-Negative Bacterial Infections; Infections; Communicable Diseases; Enterobacteriaceae Infections; Anti-Bacterial Agents; Anti-Infective Agents; Colistin
• Other Study ID Numbers: COUNT-CRE

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No