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TuberculosisPhase 2NCT05382312

Early Bactericidal Activity, Safety & Tolerability of Oral GSK3036656 in a Dual Combination With Novel and Established Antitubercular Agents, or Standard of Care in Adults With Rifampicin Susceptible Pulmonary Tuberculosis

A Phase 2 study testing GSK3036656, Bedaquiline and Delamanid in people with Tuberculosis, run by GlaxoSmithKline at 1 site in South Africa.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record
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Trial summary

This study measured the early bactericidal activity (EBA), safety, tolerability and pharmacokinetics of GSK3036656 in combination with either delamanid, bedaquiline or BTZ-043 and delamanid in combination with bedaquiline or standard of care, for 14 days, in participants with newly diagnosed sputum smear positive… Read more about this study

Who is it for?
Ages 18 to 65 years
Conditions the study is for
Tuberculosis
What is being tested?
GSK3036656, Bedaquiline and Delamanid
Could I receive a placebo?
No, everyone receives an active treatment
How many people
127 participants
Where
1 siteSouth Africa
Study dates
26 Jul 2022to 27 May 2025
Phase
Phase 2
Are there results?
Yes, posted in the registrySummary in the doctors' view

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 to 65 years
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Participants were 18 to 65 years of age inclusive, at the time of signing the informed consent.
  • Participants had:
  • A new episode of untreated, rifampicin-susceptible pulmonary tuberculosis (TB)
  • A chest X-ray picture consistent with pulmonary TB
  • At least one sputum sample positive on direct microscopy for acid-fast bacilli (at least 1+ on the International Union Against Tuberculosis and Lung Disease [IUATLD]/World Health Organization [WHO] scale) or positive on a molecular test (at least medium positive for MTB on Xpert MTB/Rif)
  • A normal echocardiogram, or an echocardiogram with normal left ventricular function with at most trace to mild valvular regurgitation, and no valvular stenosis
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  • A creatinine clearance greater than or equal to (>=) 90 mL/minute (Cockcroft-Gault formula)
  • Male participants were eligible to participate if they agreed to barrier precautions until 90 days after the last dose.
  • A female participant was eligible to participate if she was not pregnant or breastfeeding and was a woman of non-childbearing potential (WONCBP) or a woman of childbearing potential (WOCBP) using a highly effective contraceptive method. A WOCBP had to have a negative urine or serum pregnancy test, as required by local regulations, before the first dose of study intervention. Only participants who were at least 25 years of age, and females of non-childbearing potential, were eligible for the positron emission tomography-computed tomography (PET-CT) assessments.
  • Participants were capable of giving signed informed consent.

Who cannot join

  • There was evidence of a clinically significant condition or abnormality (as judged by the Investigator) (other than the indication being studied) that might have compromised safety or the interpretation of trial efficacy or safety endpoints.
  • There was clinically significant evidence of extrathoracic TB, as judged by the Investigator.
  • QTc interval corrected for heart rate by Fridericia's formula (QTcF) was greater than (>) 450 milliseconds (msec).
  • There was arterial hypertension with systolic BP >=160 mm Hg or diastolic BP >=100 mm Hg. Participants with well-controlled hypertension could be included if they were using amlodipine for the duration of the study.
  • Participants had vitiligo.
  • Participants were receiving QT-prolonging drugs, including but not limited to fluoroquinolones, macrolides, and clofazimine.
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  • HIV-infected participants who:
  • had a cluster of differentiation (CD)4+ count <350 cells/microliters;
  • had received antiretroviral therapy medication within the last 30 days;
  • had received oral or intravenous antifungal medication within the last 30 days;
  • or had an acquired immunodeficiency syndrome (AIDS)-defining opportunistic infection or malignancy in the last 12 months (except pulmonary TB).
  • Hepatitis B surface antigen (HBsAg) was present, or the Hepatitis C antibody test result at screening was positive.
  • Participants had diabetes (Type 1 or 2), point-of-care glycated hemoglobin (HbA1c) above 6.5%, or random glucose over 11.1 millimoles (mmol)/L.
  • There were diseases or conditions in which the use of delamanid or bedaquiline was contraindicated.
  • Participants had abnormal laboratory values at screening, as graded by the enhanced Common Terminology Criteria for Adverse Events (CTCAE version 5, 2017).

Trial locations and contacts

1 site in 1 country.

South Africa1 site
  • GSK Investigational Site

    Bellville, 7530

Other trials in South Africa

About this study

Official title: A Parallel Group, Phase 2A, Randomised, Open Label Treatment Study to Assess the Early Bactericidal Activity, Safety and Tolerability of GSK3036656 Administered as a Two Drug Combination With Novel and Established Antitubercular Agents, or Standard of Care in Adults With Rifampicin-susceptible Pulmonary Tuberculosis

This study measured the early bactericidal activity (EBA), safety, tolerability and pharmacokinetics of GSK3036656 in combination with either delamanid, bedaquiline or BTZ-043 and delamanid in combination with bedaquiline or standard of care, for 14 days, in participants with newly diagnosed sputum smear positive drug-sensitive pulmonary tuberculosis. Participants reverted to the standard treatment (RIFAFOUR e-275) once the study treatment (Day 1 to Day 14) was completed.

Conditions
Tuberculosis
Being tested
GSK3036656, Bedaquiline, Delamanid, RIFAFOUR e-275, BTZ-043
Keywords
Early bactericidal activity, Pulmonary tuberculosis, RIFAFOUR, Bedaquiline, Delamanid, GSK3036656, BTZ-043
Medical subject headings
Tuberculosis, Tuberculosis, Pulmonary

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • GSK3036656Drug

    GSK3036656 was administered.

  • BedaquilineDrug

    Bedaquiline was administered.

  • DelamanidDrug

    Delamanid was administered.

  • RIFAFOUR e-275Drug

    RIFAFOUR e-275 was administered.

  • BTZ-043Drug

    BTZ-043 was administered.

  • PretomanidDrug

    Pretomanid was administered.

  • LinezolidDrug

    Linezolid was administered.

  • MoxifloxacinDrug

    Moxifloxacin was administered.

Study groups in NCT05382312
Study groupRoleWhat they receive
GSK3036656 + BedaquilineExperimentalParticipants received GSK3036656 20 milligram (mg) + bedaquiline 400 mg once daily for 14 days; loading doses: 50 mg GSK3036656 (Day 1), 700 mg bedaquiline (Day 1), 500 mg (Day 2), then 400 mg daily (Days 3-14).
Receives: Drug: GSK3036656; Drug: Bedaquiline
GSK3036656 + DelamanidExperimentalParticipants received GSK3036656 20 mg + delamanid 300 mg once daily for 14 days; 50 mg GSK3036656 loading dose on Day 1.
Receives: Drug: GSK3036656; Drug: Delamanid
Delamanid + BedaquilineExperimentalParticipants received delamanid 300 mg + bedaquiline 400 mg once daily for 14 days; bedaquiline loading doses: 700 mg (Day 1), 500 mg (Day 2), then 400 mg daily (Days 3-14).
Receives: Drug: Bedaquiline; Drug: Delamanid
Standard of care for drug-sensitive tuberculosis (DS - TB)_Cohort 1ExperimentalParticipants received Rifafour e-275 (or equivalent generic) once daily for 14 days.
Receives: Drug: RIFAFOUR e-275
GSK3036656 + BTZ-043ExperimentalParticipants received GSK3036656 20 mg + BTZ-043 1000 mg once daily for 14 days; 50 mg GSK3036656 loading dose on Day 1.
Receives: Drug: GSK3036656; Drug: BTZ-043
Standard of care for DS - TB_Cohort 2ExperimentalParticipants received Rifafour e-275 (or equivalent generic) once daily for 14 days.
Receives: Drug: RIFAFOUR e-275
GSK3036656 + PretomanidExperimentalParticipants received GSK3036656 20 mg + pretomanid 200 mg once daily for 14 days; 50 mg GSK3036656 loading dose on Day 1.
Receives: Drug: GSK3036656; Drug: Pretomanid
GSK3036656 + LinezolidExperimentalParticipants received GSK3036656 20 mg + linezolid 600 mg once daily for 14 days; 50 mg GSK3036656 loading dose on Day 1.
Receives: Drug: GSK3036656; Drug: Linezolid
GSK3036656 + moxifloxacinExperimentalParticipants received GSK3036656 20 mg + moxifloxacin 400 mg once daily for 14 days; 50 mg GSK3036656 loading dose on Day 1.
Receives: Drug: GSK3036656; Drug: Moxifloxacin
Standard of care for DS TB_Cohort 3ExperimentalParticipants received Rifafour e-275 (or equivalent generic) once daily for 14 days.
Receives: Drug: RIFAFOUR e-275

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Change From Baseline in log10 Colony Forming Units (CFU) of Mycobacterium Tuberculosis (MTB)

    Baseline was defined as the mean of Day -2 and Day -1. If data was available at only one of these timepoints, then that value was used as baseline.

    Measured: At Baseline and at days 1, 2, 3, 4, 6, 8, 10, 12 and 14

Secondary outcomes (10)
  1. Change From Baseline in Time to Sputum Culture Positivity

    Baseline was defined as the mean of Day -2 and Day -1. If data was available at only one of these timepoints, then that value was used as baseline.

    Measured: At Baseline and at days 1, 2, 3, 4, 6, 8, 10, 12 and 14

  2. Number of Participants With Serious Adverse Events (SAEs)

    An SAE was defined as any untoward medical occurrence that, at any dose, resulted in death, was life-threatening, required hospitalization or prolongation of existing hospitalization, resulted in disability/incapacity, caused a congenital anomaly/birth defect, or was any other situation identified according to medical or scientific judgment.

    Measured: From Day 1 to Day 28

  3. Number of Participants With Adverse Events (AE) of Grade 3 Severity or Higher

    An AE was defined as any untoward medical occurrence in a clinical study participant, temporally associated with the use of a study intervention, whether or not it was considered related to the study intervention. The intensity of AEs was assessed using the Division of Acquired Immunodeficiency Syndrome (DAIDS) criteria Version 2.1, where grades were defined based on numeric criteria as follows: Grade 1: mild; Grade 2: moderate; Grade 3: severe or medically significant; Grade 4: potentially life-threatening; Grade 5: death. A higher grade indicated greater severity.

    Any = occurrence of the event regardless of intensity grade.

    Measured: From Day 1 to Day 28

  4. Number of Participants With Adverse Events Related to Study Treatment

    Measured: From Day 1 to Day 28

  5. Number of Participants Withdrawn From the Treatment Due to Adverse Events

    Measured: From Day 1 to Day 28

  6. Number of Participants Withdrawn From the Study Due to Adverse Events

    Measured: From Day 1 to Day 28

  7. Number of Participants With Electrocardiogram (ECG) Values of Potential Clinical Importance (PCI)

    PCI ECG values were defined as any ECG findings which, in the opinion of the investigator or medical monitor, would have interfered with the safety of the individual participant. The ECG measurements analyzed were PR Interval, QRS Duration, and QTcF Interval. A value was reported as "high" for a period if it had shifted from "low" or "within range" (W/in) at the start of the treatment period but was "high" during or at the end of the same treatment period. A value was reported as "low" for a period if it had shifted from "high" or "W/in" at the start of the treatment period but was "low" during or at the end of the same treatment period. A value was reported as "No Change" if it had remained unchanged (e.g., High to High), or as "To W/in Range" if it had been within range.

    Measured: From Day 1 to Day 28

  8. Number of Participants With Hematology Laboratory Values of PCI

    The analyzed hematology parameters were hematocrits, hemoglobin, lymphocytes, neutrophils, and platelets. A value was reported as "high" for a period if it had shifted from "low" or "within range" (W/in) at the start of the treatment period but was "high" during or at the end of the same treatment period. A value was reported as "low" for a period if it had shifted from "high" or "W/in" at the start of the treatment period but was "low" during or at the end of the same treatment period. A value was reported as "No Change" if it had remained unchanged (e.g., High to High), or as "To W/in Range" if it had been within range.

    Measured: From Day 1 to Day 28

  9. Number of Participants With Clinical Chemistry Laboratory Values of PCI

    The chemistry parameters analyzed were glucose, alanine aminotransferase (ALT), aspartate aminotransferase (AST), bilirubin, calcium, creatinine, potassium, and sodium. A value was reported as "high" for a period if it had shifted from "low" or "within range" (W/in) at the start of the treatment period but was "high" during or at the end of the same treatment period. A value was reported as "low" for a period if it had shifted from "high" or "W/in" at the start of the treatment period but was "low" during or at the end of the same treatment period. A value was reported as "No Change" if it had remained unchanged (e.g., High to High), or as "To W/in Range" if it had been within range.

    Measured: From Day 1 to Day 28

  10. Number of Participants With Vital Signs of PCI

    The analyzed vital signs were systolic blood pressure, diastolic blood pressure, pulse rate. A value was reported as "high" for a period if it had shifted from "low" or "within range" (W/in) at the start of the treatment period but was "high" during or at the end of the same treatment period. A value was reported as "low" for a period if it had shifted from "high" or "W/in" at the start of the treatment period but was "low" during or at the end of the same treatment period. A value was reported as "No Change" if it had remained unchanged (e.g., High to High), or as "To W/in Range" if it had been within range.

    Measured: From Day 1 to Day 28

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted19 May 2022
  2. Study start26 Jul 2022
  3. Primary completion27 May 2025
  4. Study completion27 May 2025

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 2
Primary purpose
Other
Allocation
Randomised
Intervention model
Parallel groups
Masking
Single blind
Who is masked
Outcomes assessor
Enrolment
127 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT05382312
Sponsor's protocol ID
214912
Status last verified
May 2026
First submitted
16 May 2022
Last updated
17 Jun 2026
Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
Individual data sharing
Yes: IPD for this study will be made available via the Clinical Study Data Request site.

Questions about this trial

What is this clinical trial studying?

A Phase 2 study testing GSK3036656, Bedaquiline and Delamanid in people with Tuberculosis, run by GlaxoSmithKline at 1 site in South Africa.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 10 inclusion and 15 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: finished, as of the sponsor's last update on 17 Jun 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 1 site in South Africa. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this phase mean?

Phase 2 studies give the treatment to a larger group to see whether it has the intended effect and to keep checking safety.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

Yes. Results are posted in the registry (first posted 17 Jun 2026). A summary is in the For doctors view, and the full results are on ClinicalTrials.gov.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Change From Baseline in log10 Colony Forming Units (CFU) of Mycobacterium Tuberculosis (MTB) (time frame: At Baseline and at days 1, 2, 3, 4, 6, 8, 10, 12 and 14). It is what the study was designed to measure, not a finding.

Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 17 Jun 2026.

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