Clinical Study on the Early Bactericidal Activity of Contezolid Against Mycobacterium Abscessus Disease

January 23, 2026 updated by: Nie WenJuan, Beijing Chest Hospital
This study is a single-center, randomized, controlled, open-label clinical trial designed to assess the early bactericidal activity of a single agent, contezolid, in patients with Mycobacterium abscessus infections. Patients were administered contezolid monotherapy for 14 days specifically targeting Mycobacterium abscessus, and were compared to a control group receiving linezolid, a classic anti-Mycobacterium abscessus drug. The comparison was conducted through the analysis of colony forming units counts and Time To Positivity in sputum cultures. By evaluating the impact of contezolid monotherapy on the bacterial load in the sputum of patients with Mycobacterium abscessus infections, this study aimed to assess the early bactericidal activity of contezolid, thereby providing a basis for the selection of new therapeutic options for the treatment of patients with Mycobacterium abscessus infections.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Enrolling by invitation

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Detailed Description

As one of the drugs for treating Mycobacterium abscessus infections, linezolid is effective but its use is limited in anti-Mycobacterium abscessus treatment regimens due to the high incidence of adverse reactions associated with long-term use. Contezolid, a new drug developed in China, belongs to the oxazolidinone class of drugs and shares a similar antibacterial spectrum with linezolid, while exhibiting a significantly better safety profile. This study is a single-center, randomized, controlled, open-label clinical trial designed to evaluate the early bactericidal activity. It enrolls patients with Mycobacterium abscessus disease and administers a 14-day monotherapy of contezolid for the treatment of the disease. The study compares contezolid with linezolid, a classic anti-Mycobacterium abscessus drug, by analyzing colony forming units and Time To Positivity in sputum cultures. By assessing the impact of contezolid monotherapy on the bacterial load in the sputum of patients with Mycobacterium abscessus disease, the study evaluates the early bactericidal activity of contezolid, providing a basis for the selection of new therapeutic options for the treatment of Mycobacterium abscessus disease.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Estimated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
24

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 2

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • China
    • Beijing Municipality
      • Beijing, Beijing Municipality, China, 101149
        • Beijing chest hospital affiliated to Capital medical university, Beijing Tuberculosis & Thoracic Tumor Research Institute

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Male or female aged between 18 and 65 years old;
  • Weight ranging from 40 kg to 90 kg;
  • At least one positive sputum culture for Mycobacterium abscessus within 6 months prior to screening, and one positive sputum culture for Mycobacterium abscessus with molecular species identification during the screening period within 1 month prior to the study;
  • Voluntary participation in this study and signing of the informed consent form; (5) Male and female participants must use effective contraception during the study and for 1 month after the study ends.

Exclusion Criteria:

  • Patients who have been on long-term corticosteroid therapy or taking immunosuppressants within 90 days prior to screening;
  • Pregnant women, postpartum women, and lactating patients;
  • Patients with a history of bedaquiline allergy or known hypersensitivity, or a history of severe adverse reactions;
  • Patients with evidence of bedaquiline resistance;
  • Patients deemed unsuitable for participation in this study by the investigator's assessment;
  • Patients whom the investigator believes participation in this study would harm their health, or who are unlikely to comply with the scheduled visits and assessments as outlined in the protocol, and therefore are not suitable for participation in this study.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

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

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: Contezolid group
Contezolid 800mg twice daily for 14 days. To enroll 12 patients with Mycobacterium abscessus infections, who will receive continuous administration of contezolid for 14 days. Sputum samples will be collected for colony forming units counting and Time To Positivity observation to evaluate the Early Bactericidal Activity.
Drug: Contezolid
Patients with Mycobacterium abscessus infections were enrolled and treated with a 14-day monotherapy of contezolid for anti-Mycobacterium abscessus therapy, through analysis and comparison of colony forming units and Time To Positivity in sputum cultures.
Other Names:
  • Oxazolidinone
Active Comparator: Linezolid group
Linezolid 600mg once daily for 14 days. To enroll 12 patients with Mycobacterium abscessus infections, who will receive continuous administration of linezolid for 14 days. Sputum samples will be collected for colony forming units counting and Time To Positivity observation to evaluate the Early Bactericidal Activity.
Drug: linezolid
Patients with Mycobacterium abscessus infections were enrolled and treated with a 14-day monotherapy of linezolid for anti-Mycobacterium abscessus therapy, through analysis and comparison of colony forming units and Time To Positivity in sputum cultures.
Other Names:
  • Oxazolidinone

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Time To Positivity in sputum cultures
Time Frame: 14 days
With a 14-day monotherapy of contezolid for anti-Mycobacterium abscessus therapy, then were compared with a control group receiving linezolid, a classic anti-Mycobacterium abscessus drug, through analysis and comparison of Time To Positivity in sputum cultures.
14 days

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Beijing Chest Hospital

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Study Director: Wenjuan Nie, Director, Beijing Tuberculosis & Thoracic Tumor Research Institute Beijing Chest Hospital affiliated to Capital Medical University

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
January 1, 2026

Primary Completion (Estimated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
December 31, 2026

Study Completion (Estimated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
December 31, 2026

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
January 28, 2025

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
January 23, 2026

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
January 28, 2026

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
January 28, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
January 23, 2026

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
January 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • GCP-TB-2024-11-15

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

IPD Plan Description

In our hospital, the investigators are not allowed to casually publish participants' information and hospital data on the website.

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

Cookie Settings

We use cookies to ensure that we give you the best experience on our website. For more details carefully read our Privacy and Cookies Policy. ...>>>You can change your preferences or withdraw your consent at any time by deleting the cookies from your website or computer as described in the policy. Please accept it and choose your preferences by ticking the corresponding boxes in the "Manage Settings" section below. Please carefully read our Terms of Service before you proceed with using any part of this website.
«Manage Settings