ClinicalTrials.gg
TerminatedNCT04311502Updated Jul 8, 2026Results posted

Clofazimine- and Rifapentine-Containing Treatment Shortening Regimens in Drug-Susceptible Tuberculosis: The CLO-FAST Study

A Phase 2 interventional study of Rifapentine and Rifampicin in HIV and Tuberculosis, sponsored by National Institute of Allergy and Infectious Diseases (NIAID). Terminated at 6 sites in 5 countries. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2026-07-08.

Sponsored by National Institute of Allergy and Infectious Diseases (NIAID) · Phase 2, Interventional, and Treatment

Why this study was terminated
Accrual was permanently closed due to futility in the experimental arm on June 22, 2023. Follow-up in the experimental arm was extended to 117 weeks.
Phase
Phase 2
Study type
Interventional
Enrollment
104
Allocation
Randomized
Ages
18 Years and older
Sex
All
01

Study summary

The purpose of this study was to compare a 3-month rifapentine (RPT)/clofazimine (CFZ)-containing regimen with a CFZ loading dose with the 6-month standard of care (SOC) regimen for drug-susceptible (DS) tuberculosis (TB).

Read the detailed description

This study compared a 3-month rifapentine (RPT)/clofazimine (CFZ)-containing regimen with a CFZ loading dose with the 6-month standard of care (SOC) for drug-susceptible (DS) tuberculosis (TB).

Randomization was stratified based on HIV status and the presence of advanced disease as determined by chest X-ray.

Participants were randomized to one of three arms:

  • Arm 1 (Experimental): rifapentine/isoniazid/pyrazinamide/ethambutol (PHZE) + CFZ 300 mg once daily for 2 weeks; then PHZE + CFZ 100 mg once daily for 6 weeks; then rifapentine/isoniazid/pyrazinamide (PHZ) + CFZ 100 mg once daily for 5 weeks
  • Arm 2 (SOC): rifampicin/isoniazid/pyrazinamide/ethambutol (RHZE) for 8 weeks; then rifampicin/isoniazid (RH) for 18 weeks
  • Arm C (PK-only subgroup): PHZE + CFZ 100 mg once daily for 4 weeks; then remain on study, off study medications and treated according to SOC (RHZE for 4 weeks; then RH for 18 weeks)

All participants received pyridoxine (vitamin B6) with each dose of isoniazid (INH) based on current local, national or international dosing guidelines.

Arm 1 participants were treated for 13 weeks (including a 2-week CFZ loading dose of 300 mg daily). Arm 2 participants were treated for 26 weeks, and Arm C participants were treated for 4 weeks.

All participants in Arms 1, 2, and C were followed from randomization to Week 65.

On June 1, 2023, the Data and Safety Monitoring Board (DSMB) recommended that the study permanently close to accrual because of the high rate of treatment failure and TB recurrence. The A5362 team, NIAID and DAIDS leadership, and ACTG leadership concurred with the DSMB's recommendation and the study was closed to accrual on June 2, 2023. A letter of amendment was created that extended follow-up to 117 weeks for some participants in Arm 1.

Due to the early close to accrual, a primary analysis report forming the basis of the primary trial manuscript used data collected at study visits up to and including the date when the last enrolled participant completed the week 26 study visit (September 25. 2023). Another final analysis was performed using data collected at study visits up to the date when the last enrolled participant completed the week 65 assessment.

Study visits included physical examinations; blood, urine, and/or sputum collection; chest X-rays; and electrocardiograms (ECG).

02

Conditions studied

  • HIV
  • Tuberculosis

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Keywords

  • rifapentine
  • clofazimine
  • drug-susceptible tuberculosis
  • tuberculosis treatment shortening
03

In context

Tuberculosis

1,170 studies on the registry are indexed under Tuberculosis; 175 are open to participants now.

This study's enrollment of 104 is below the median of 150 across 820 interventional studies indexed under Tuberculosis.

Browse Tuberculosis studies →

Lead sponsor

National Institute of Allergy and Infectious Diseases (NIAID) is the lead sponsor of 2,446 studies on the registry; 179 are open to participants now.

Of its 405 completed or terminated interventional studies of FDA-regulated products, 302 (75%) have results posted.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
18 Years and older
Sexes eligible
All
Accepts healthy volunteers
No

Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.

Inclusion criteria

  • Pulmonary TB (among participants with or without history of prior TB treatment) identified within 5 days prior to entry by:

    • At least one sputum specimen positive for M. tuberculosis by molecular TB assay (Xpert) or line probe assay [LPA]) OR
    • At least one sputum specimen positive (1+ or greater) for acid-fast bacilli (AFB) on smear microscopy
    • Note: TB diagnosis for purposes of meeting inclusion criterion can be from a study testing laboratory or from an outside laboratory, as long as it is from a sputum sample collected within 5 days prior to entry.
  • Pulmonary TB diagnosed without known INH resistance (e.g., by LPA or Xpert) and without known RIF resistance (e.g., by either LPA or Xpert).
  • Absence of -1 infection, as documented by any licensed rapid HIV test or HIV-1 enzyme or chemiluminescence immunoassay (E/CIA) test kit, within 30 days prior to entry OR HIV-1 infection, documented by any licensed rapid HIV test or HIV-1 E/CIA test kit at any time prior to entry and confirmed by a licensed Western blot or a second antibody test by a method other than the initial rapid HIV and/or E/CIA, or by HIV-1 antigen or plasma HIV-1 RNA viral load. Two or more HIV-1 RNA viral loads of >1,000 copies/mL are also acceptable as documentation of HIV-1 infection.
  • For participants living with HIV, ≥100 cells/mm\^3, obtained within 30 days prior to study entry at any network-approved non-US laboratory that is Immunology Quality Assessment (IQA) certified.
  • For participants living with HIV must be currently receiving or planning to initiate antiretroviral therapy (ART) at or before study week 8.
  • A verifiable address or residence readily accessible to facilitate directly observed therapy (DOT), and willingness to inform the study team of any change of address during the treatment and follow-up period.
  • The following laboratory values obtained at or within 5 days prior to entry by any US laboratory that has a Clinical Laboratory Improvement Amendments (CLIA) certification or its equivalent, or at any network-approved non-US laboratory that operates in accordance with Good Clinical Laboratory Practice (GCLP) and participates in appropriate external quality assurance programs.

    • Serum or plasma (ALT) ≤3 times the (ULN)
    • Serum or plasma total ≤2.5 times ULN
    • Serum or plasma creatinine ≤2 times ULN
    • Serum or plasma potassium ≥3.5 mEq/L and ≤5.5 mEq/L
    • (ANC) ≥650/mm\^3
    • ≥7.0 g/dL
    • count ≥50,000/mm\^3
  • For females of , negative serum or urine pregnancy test within 5 days prior to entry by any US clinic or laboratory that has a Clinical Laboratory Improvement Amendments (CLIA) certification or its equivalent, or is using a point of care (POC)/CLIA-waived test, or at any network-approved non-US laboratory or clinic that operates in accordance with Good Clinical Laboratory Practice (GCLP) and participates in appropriate external quality assurance programs.
  • Female participants of reproductive potential must agree not to participate in the conception process (i.e., active attempt to become pregnant, in vitro fertilization), and if participating in sexual activity that could lead to pregnancy, must agree to use at least one reliable nonhormonal method of , as listed below, while on study treatment and for 30 days after stopping study medications.

    • Acceptable forms of contraception include:
    • Condoms
    • Intrauterine device or intrauterine system
    • Cervical cap with spermicide
    • Diaphragm with spermicide
    • Note: Hormonal birth control alone is not acceptable, as it may not be sufficiently reliable in combination with RPT or RIF.
  • Female participants who are not of reproductive potential must have documentation of menopause (i.e., at least 1 year amenorrheic), hysterectomy, or bilateral oophorectomy or bilateral tubal ligation.
  • Documentation of performance score ≥50 within 30 days prior to entry.
  • Documentation of either the presence or absence of advanced disease as determined by chest X-ray within 5 days prior to entry.
  • Ability and willingness of participant to provide .

Exclusion criteria

Exclusion Criteria:

  • More than 5 days of treatment directed against active TB for the current TB episode preceding study entry.
  • Pregnant or breast-feeding.
  • Unable to take oral medications.
  • Current receipt of clofazimine or bedaquiline or known receipt of clofazamine or bedaquiline at any time in the past.
  • based on the Fridericia correction method (QTcF) interval >450 ms for men or >470 ms for women within 30 days prior to entry.
  • Weight \<30 kg.
  • Current or planned use within 6 months following enrollment of one or more of the following medications: protease inhibitors, HIV entry and fusion inhibitors, HIV non-nucleoside reverse transcriptase inhibitors (other than EFV), elvitegravir/cobicistat, bictegravir, quinidine, procainamide, amiodarone, sotalol, disopyramide, ziprasidone, or terfenadine.
  • Current extrapulmonary TB, in the opinion of the site investigator.
  • Current or history of known personal or family long QT syndrome.
  • Known allergy/sensitivity or any to components of study TB drugs or their formulation.
  • Active drug, alcohol use or dependence; or mental illness (e.g., major depression) that, in the opinion of the site investigator, would interfere with adherence to study requirements.
  • Known history of acute intermittent porphyria.
  • Other medical conditions (e.g., severe uncontrolled diabetes, liver or kidney disease, blood disorders, peripheral neuritis, chronic diarrhea) in which the current clinical condition of the participant is likely to prejudice the response to, or assessment of, treatment.
Terms in these criteria, in plain language(14)

Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.

HIV

The human immunodeficiency virus, which weakens the immune system.

Many studies now accept people whose HIV is controlled on treatment, judged by the viral load and the CD4 count. Check the limits this study sets.

CD4 count

The number of CD4 cells, a type of white blood cell, in a given amount of blood. It is used to follow how well the immune system is doing in HIV.

ALT and AST (liver enzymes)

Two enzymes measured in a routine blood test of the liver. Higher levels can mean the liver is under strain or damaged. SGPT and SGOT are older names for ALT and AST.

Criteria usually give a limit as a multiple of the upper limit of normal (ULN), often higher when cancer has spread to the liver.

ULN (upper limit of normal)

The top of the normal range for a blood test, as set by the laboratory that runs it. Each lab prints its own range next to your result.

“≤ 2.5 × ULN” means the result can be up to two and a half times that top value.

Bilirubin

A yellow substance made when red blood cells are broken down, which the liver clears. A high level can mean a problem with the liver or the bile ducts.

Criteria often allow more for people with Gilbert’s syndrome, a harmless inherited condition that raises bilirubin.

Absolute neutrophil count (ANC)

The number of neutrophils, white blood cells that help fight infection, in a given amount of blood. Too few raises the risk of infection.

It is a count, not a percentage of the white cells. Limits are written in units that mean the same: ≥ 1.5 × 10⁹/L is ≥ 1,500 per mm³ (µL). Each lab has its own reference range.

Hemoglobin (Hb)

The protein in red blood cells that carries oxygen. A low level is anaemia, which can cause tiredness and breathlessness. Measured in g/dL or g/L (9 g/dL is 90 g/L).

Platelets

Blood cells that help blood clot. Too few raises the risk of bleeding and bruising. A usual adult range is about 150–400 × 10⁹/L (150,000–400,000 per µL); each lab has its own reference range.

Reproductive potential

Able to have children. For women this usually means from the first period until menopause, unless permanently unable to through surgery; for men, unless permanently sterile. Read who the line is about — participants, women, men, or their partners.

Criteria about it usually ask for contraception during the study and for a time after it.

Contraception

Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.

Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.

Karnofsky performance status (KPS)

A 0–100 scale of how well someone can carry out everyday activities. 100 is no complaints and no signs of illness; 70 is able to look after yourself but not to work or keep up normal activity; 50 is needing considerable help and frequent medical care.

Studies often ask for 60 or 70 and above. Your doctor gives the score.

Informed consent

Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.

You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.

QT and QTc

On an ECG, the QT interval is the time the heart’s lower chambers take to activate electrically and recover in each beat. QTc is that time adjusted for heart rate (QTcF by Fridericia’s formula, QTcB by Bazett’s). Some medicines lengthen it, and a long QTc can raise the risk of a dangerous heart rhythm.

The study may name a correction formula and a limit in milliseconds, often around 450–480.

Hypersensitivity

An allergy, or another reaction of the immune system, to a substance. “Hypersensitivity to the study drug” means a known allergic reaction to it — not every side effect a medicine can have.

05

Study design

Phase
Phase 2
Primary purpose
Treatment
Allocation
Randomized
Intervention model
Parallel assignment
Masking
None (open label)
Enrollment
104 participants (actual)

Study arms

  • Experimental
    Arm 1: Experimental

    Participants received rifapentine/isoniazid/pyrazinamide/ethambutol (PHZE) + clofazimine (CFZ) 300 mg once daily for 2 weeks; then PHZE + CFZ 100 mg once daily for 6 weeks; then rifapentine/isoniazid/pyrazinamide (PHZ) + CFZ 100 mg once daily for 5 weeks.

    Drug: Rifapentine · Drug: Isoniazid · Drug: Pyrazinamide · Drug: Ethambutol · Drug: Clofazimine loading dose

  • Active comparator
    Arm 2: Standard of care

    Participants received rifampicin/isoniazid/pyrazinamide/ethambutol (RHZE) for 8 weeks; then rifampicin/isoniazid (RH) for 18 weeks.

    Drug: Rifampicin · Drug: Isoniazid · Drug: Pyrazinamide · Drug: Ethambutol

  • Experimental
    Arm C: PK only subgroup

    Participants received PHZE + CFZ 100 mg once daily for 4 weeks; then remained on study, and were treated with off study medications according to local SOC (RHZE for 4 weeks; then RH for 18 weeks).

    Drug: Rifapentine · Drug: Isoniazid · Drug: Pyrazinamide · Drug: Ethambutol · Drug: Clofazimine 100 MG

Interventions

  • 1200 mg once daily

  • 600 mg once daily

  • 300 mg once daily

  • 1000mg once daily if weight is 40 to \<55kg; 1500mg once daily if weight is 55 to \<71kg; 2000mg once if weight is ≥71kg

  • 800 mg once daily if weight is 40 to \<55kg; 1200 mg once daily if weight is 55 to \<71kg; 1600mg once if weight is ≥71kg

  • DrugClofazimine loading dose

    300 mg once daily for 2 weeks (loading dose), then 100 mg once daily

  • 100 mg once daily

06

What researchers measure

Primary outcomes

  1. Time to 12 Weeks Stable Culture Conversion in Liquid Media

    The time of stable culture conversion was the visit corresponding to the first of two consecutive negative cultures without an intervening positive, and/or visits wherein the participant was unable to produce sputum and had no signs of active TB. If a participant did not culture convert, they were censored at their last culture result (regardless of result). If a participant died before conversion they were censored at 12 weeks. Participants who were lost to follow-up prior to 12 weeks with their last culture being positive were censored at 12 weeks (i.e. assumed they did not have a culture conversion by week 12), and participants who were lost to follow-up prior to 12 weeks with their last culture being negative were censored at the last sampling visit for which they had a valid culture result.

    Time frame: From Entry through Week 12

  2. Participants Experiencing Any Grade 3 or Higher Adverse Event (AE) That is at Least a One Grade Increase From Baseline Over 65 Weeks

    An adverse event is any unfavorable and unintended sign, symptom, or diagnosis that occurs in a study participant during the conduct of the study REGARDLESS of the attribution. Adverse events are graded on a scale from 1-5: 1=mild, 2=moderate, 3=severe, 4=life-threatening, 5=death. AE grading was per Division of AIDS Table for Grading the Severity of Adult and Pediatric Adverse Events (DAIDS AE Grading Table V2.1, Corrected Version 2.1, July 2017) The primary manuscript outcome measure includes data through week 65 up to September 25, 2023

    Time frame: From entry through Week 65

Secondary outcomes

  1. Proportion of Participants With Favorable Clinical/Bacteriologic Outcome (Definition A) at 65 Weeks Post-randomization

    Favorable Outcome are: * liquid culture negative at week 65 * without signs or symptoms of ongoing active TB and unable to produce sputum at 65 weeks * who at the end of the follow-up period are clinically without signs/symptoms of ongoing active TB and produce a sputum specimen that is contaminated in two liquid cultures without evidence of TB Unfavorable: * Absence of cure: Having a sputum sample at or after EOT that is culture-positive (any medium) with a second positive sample obtained 4 hours following the first sample. * Death from any cause except for violent or accidental cause * Had a positive culture for Mtb when last seen * Had a treatment extension beyond nominal level due to clinically inadequate response Unevaluable are: * lost to follow-up during treatment or post-treatment with their last culture being negative for Mtb * violent or accidental death * becoming pregnant during their assigned active treatment and stop their assigned treatment.

    Time frame: From entry through Week 65

  2. Proportion of Participants With Favorable Composite Outcome (Definition B) at 65 Weeks Post-randomization

    Favorable Outcome are: Same as definition A Unfavorable: Same as definition A and: * lost to follow-up during treatment phase * failing to complete treatment * receiving any one or more of the following: extension of treatment beyond the nominal level, except to make up missed doses; re-starting treatment following \>= 30 consecutive days lost to follow-up; a change in at least one drug in treatment regimen for any reason except re-infection, pregnancy, or temporary drug challenge Unevaluable are: * lost to follow-up after treatment phase, and not assessable at the end of follow-up, with their last culture being negative for Mtb * Violent death or accidental death * Women who become pregnant during their assigned active treatment and stop their assigned treatment

    Time frame: From entry through Week 65

  3. Number of Participants Who Prematurely Discontinue Their Treatment Regimen Through 65 Weeks

    Premature discontinuation is defined as discontinuation other than due to violent death, natural disaster, or administrative censoring

    Time frame: From entry through Week 65

  4. Mean QTcF

    QT interval measured as the average of three electrocardiogram (ECG) readings taken 5-10 minutes apart, corrected with Fridericia correction

    Time frame: Measured at Weeks 2, 8, and 13 (end of investigational treatment)

  5. QTcF Interval Mean Change From Baseline

    Mean change from baseline in mean QTcF at weeks 2, 8, and end of treatment (EOT)

    Time frame: Measured at baseline and Weeks 2, 8, and 13 (end of investigational treatment)

  6. Categorized QTcF

    Absolute QTcF was categorized as:\< 480; ≥480 ms and \<500 ms; ≥500 ms

    Time frame: Week 2, 8, and Week 13

  7. Categorized Change From Baseline

    Categorized change from baseline as: change from baseline of \<30 ms; change from baseline of ≥30 ms and \<60 ms; change from baseline of ≥60 ms

    Time frame: Measured at Weeks 2, 8, and Week 13

  8. Time to Stable Culture Conversion in Liquid Media Through Week 65

    Defined as the first of two (consecutive or non-consecutive) negative sputum cultures without an intervening positive culture, and/or visits wherein the participant is unable to produce sputum and has no signs of active TB

    Time frame: From entry through Week 65

  9. Time to Stable Culture Conversion in Solid Media Through Week 65

    The time of stable culture conversion was the visit corresponding to the first of two consecutive negative cultures without an intervening positive, and/or visits wherein the participant was unable to produce sputum and had no signs of active TB. If a participant did not culture convert, they were censored at their last culture result (regardless of result). If a participant died before conversion, the death was considered as a competing event. Participants who were lost to follow-up prior to 65 weeks with their last culture being positive were censored at 65 weeks (i.e. assumed they did not have a culture conversion by week 65), and participants who were lost to follow-up prior to 65 weeks with their last culture being negative were censored at the last sampling visit for which they had a valid culture result. Adjusted model adjusts for HIV-1 status (positive/negative) and TB Disease at Screening (Advanced/Not Advanced).

    Time frame: From entry through Week 65

  10. Number of Participants Achieving Stable Liquid Culture Conversion by Week 8

    Defined as the first of two (consecutive or non-consecutive) negative sputum cultures without an intervening positive culture, and/or visits wherein the participant is unable to produce sputum and has no signs of active TB

    Time frame: From entry through Week 8

  11. Number of Participants Achieving Stable Solid Culture Conversion by Week 8

    Defined as the first of two (consecutive or non-consecutive) negative sputum cultures without an intervening positive culture, and/or visits wherein the participant is unable to produce sputum and has no signs of active TB

    Time frame: From entry through Week 8

  12. Number of Participants With One or More Serious Adverse Events (SAEs)

    Cumulative proportion with at least one Serious Adverse Event (SAE) A SAE is defined as any untoward medical occurrence that: * Results in death * Is life-threatening * Requires inpatient hospitalization or prolongation of existing hospitalization * Results in persistent or significant disability/incapacity * Is a congenital anomaly/birth defect * Is an important medical event that many not be immediately life-threatening or result in death or hospitalization but may jeopardize the patient or may require intervention to prevent one of the other outcomes listed in the definition above.

    Time frame: From entry through Week 65

  13. Number of Participants Achieving Stable Solid Culture Conversion by Week 12

    Defined as the first of two (consecutive or non-consecutive) negative sputum cultures without an intervening positive culture, and/or visits wherein the participant is unable to produce sputum and has no signs of active TB

    Time frame: From entry through Week 12

  14. Median Time (Days) to Positivity in Liquid Culture (MGIT)

    Time (days) to positivity in liquid culture (MGIT) is defined as the number of days it takes for the culture to produce results up to a max of 42 days. For negative culture results, time to positivity is imputed as 42 days.

    Time frame: From screening, entry, weeks 1, 2, 3, 4, 6, 8, 10, 12

  15. Change in Chest X-ray Score From Baseline to End of Treatment in Each Arm

    The chest X-ray was posterior-anterior. Extent of disease (limited to one lobe or region, unilateral, bilateral, or diffuse) and cavitation status (cavities present \[location\] or absent) was documented by validated numerical score (percent of total lung affected by any pathology + 40 if cavitation is present; 0 = No percent affected, 140 = entire lung is affected + cavitation is present) for grading chest X-ray in adult smear-positive pulmonary TB (Thorax 2010; 65(10):863-9). Analysis was conducted based on site readings of CXR

    Time frame: Entry, End of Treatment (Week 13 for Arm 1 and Week 26 for Arm 2)

  16. Proportion of Participants Who Have a TB Relapse, From End of Treatment Until Week 65

    The time of relapse is defined as the time from end of treatment until the first sputum sample that is culture positive in liquid or solid media for an Mtb strain that has matching genotype with the baseline isolate (as determined by whole genome sequencing). A second positive sputum sample obtained at least 4 hours following the first sputum collection is required to confirm a relapse. If the second sputum sample was negative, this was not counted as a relapse. If a participant was lost to follow-up without a second sputum sample confirmation of relapse (including contaminated or missing), it was counted as a relapse. Whole genome sequencing of samples, which is necessary to assess TB relapse, was not performed due to lack of funding. There is no plan to test these samples in the future.

    Time frame: From end of treatment (week 13 for Arm 1; week 26 for Arm 2) to week 65

  17. Cumulative Proportion of Participants Who Have a TB Recurrence, From End of Treatment Until Week 65

    The time of recurrence is defined as the time from end of treatment until the first sputum sample that is culture positive in liquid or solid media. A second positive sputum sample obtained at least 4 hours following the first sputum collection is required to confirm a recurrence. If the second sputum sample was negative, this will not be counted as a recurrence. If a participant was lost to follow-up without a second sputum sample confirmation of recurrence (including contaminated or missing), it was counted as a recurrence. Participants at risk for recurrence where those who were stable culture conversions by end of treatment.

    Time frame: From end of treatment (week 13 for Arm 1; week 26 for Arm 2) to week 65

  18. Pharmacokinetic Parameter for CFZ: Minimum Concentration (Cmin)

    Estimated using noncompartmental methods applied to concentrations from intensive PK sampling visits at weeks 2 and 13.

    Time frame: Measured at Weeks 2 and 13

  19. Pharmacokinetic Parameter for CFZ: Maximum Concentration (Cmax)

    Estimated using noncompartmental methods applied to concentrations from intensive PK sampling visits at weeks 2 and 13.

    Time frame: Measured at Weeks 2 and 13

  20. Pharmacokinetic Parameter for CFZ: Time of Cmax (Tmax)

    Estimated using noncompartmental methods applied to concentrations from intensive PK sampling visits at weeks 2 and 13.

    Time frame: Measured at Weeks 2 and 13

  21. Pharmacokinetic Parameter for CFZ: Area Under the Concentration Curve (AUC0-24h)

    Estimated using noncompartmental methods applied to concentrations from intensive PK sampling visits at weeks 2 and 13.

    Time frame: Measured at Weeks 2 and 13

  22. Mean Change From Baseline in Skin Pigmentation (Colorimetric L*)

    The median of triplicate measurements of Inner Arm, and Face (median of all measurements from the Chin, Forehead, Left Cheek, and Right Cheek). L represents lightness (0 = black, 100 = white). Further data processing removed values if one of the triplicates differed more than 5% of the median.

    Time frame: Entry, Weeks 8, 13, 26, and 65

  23. Mean Change From Baseline in Skin Pigmentation (Colorimetric a*)

    The median of triplicate measurements of Inner Arm, and Face (median of all measurements from the Chin, Forehead, Left Cheek, and Right Cheek). The a\* parameter represents the balance between red and green. Positive values of a\* indicate a reddish tone, while negative values indicate a greenish tone. (-128 = Green, 127 = Red). Further data processing removed values if one of the triplicates differed more than 5% of the median.

    Time frame: Entry, Weeks 8, 13, 26, and 65

  24. Mean Change From Baseline in Skin Pigmentation (Colorimetric b*)

    The median of triplicate measurements of Inner Arm, and Face (median of all measurements from the Chin, Forehead, Left Cheek, and Right Cheek). The b\* parameter represents the balance between yellow and blue. Positive values of b\* indicate a yellowish tone, while negative values indicate a bluish tone (-128 = Blue, 127 = Yellow). Further data processing removed values if one of the triplicates differed more than 5% of the median.

    Time frame: Entry, Weeks 8, 13, 26, and 65

  25. Change From Baseline in Participant-reported Changes in Skin Pigment Related to Perceived Skin Hyperpigmentation

    Subjective questionnaire asked the following questions : 1.) On a scale from 0 to 10: (0 being none and 10 being most significant possible) How would you rate any change in the coloration of your skin since you began TB treatment?

    Time frame: Entry, Weeks 8, 13, 26, and 65

  26. Change From Baseline in Participant-reported Distress Caused by Change in Skin Pigment Related to Perceived Skin Hyperpigmentation

    Subjective questionnaire asked the following questions: On a scale from 0 to 10: (0 being none and 10 being worst possible) How would you rate your distress to skin coloration changes since you began TB treatment, if any?

    Time frame: Entry, Weeks 8, 13, 26, and 65

07

Results

Posted Aug 27, 2025
Limitations and caveats
Enrollment to this study was terminated early based on a recommendation from the independent DSMB for the study. This was due to the high rate of unfavorable outcomes and recurrences in Arm 1. As a consequence, the study had reduced precision to evaluate the primary biomarker outcome related to time to stable culture conversion.

Participant flow

Participants were enrolled from November 2021 to March 2023 in 6 sites located in Malawi (2 sites), South Africa, Zimbabwe, India, and Haiti. A screening and accrual pause was instated on April 4, 2023 and subsequently formally closed to accrual on June 2, 2023 in response to recommendations from the DSMB.

Follow-up Through Week 65
Participant flow — Follow-up Through Week 65
MilestoneArm 1: ExperimentalArm 2: Standard of CareArm C: PK Only Subgroup
Started583115
Started treatment and were not late exclusions553115
Completed222714
Not completed3641
Withdrew: Death111
Withdrew: Lost to follow-up230
Withdrew: Participant is in prison100
Withdrew: Participant moved out of country100
Withdrew: Withdrawal by subject200
Withdrew: Dsmb mandated extension of follow-up2900
DSMB Mandated Extension of Follow-up
Participant flow — DSMB Mandated Extension of Follow-up
MilestoneArm 1: ExperimentalArm 2: Standard of CareArm C: PK Only Subgroup
Started2900
Completed2700
Not completed200
Withdrew: Lost to follow-up200

Outcome measures

PrimaryTime to 12 Weeks Stable Culture Conversion in Liquid Media

The time of stable culture conversion was the visit corresponding to the first of two consecutive negative cultures without an intervening positive, and/or visits wherein the participant was unable to produce sputum and had no signs of active TB. If a participant did not culture convert, they were censored at their last culture result (regardless of result). If a participant died before conversion they were censored at 12 weeks. Participants who were lost to follow-up prior to 12 weeks with their last culture being positive were censored at 12 weeks (i.e. assumed they did not have a culture conversion by week 12), and participants who were lost to follow-up prior to 12 weeks with their last culture being negative were censored at the last sampling visit for which they had a valid culture result.

Time frame:
From Entry through Week 12
Reported as:
Median · weeks
Time to 12 Weeks Stable Culture Conversion in Liquid Media
weeksArm 1: ExperimentalArm 2: Standard of Care
Time to 12 Weeks Stable Culture Conversion in Liquid Media6 (4 to 8)8 (6 to 10)
Statistical analysis
  • Arm 1: Experimental vs Arm 2: Standard of Care · Regression, Cox · p = 0.21 · Hazard ratio (hr): 1.21 · 90% CI 0.82 to 1.79Arm 1 vs Arm 2
PrimaryParticipants Experiencing Any Grade 3 or Higher Adverse Event (AE) That is at Least a One Grade Increase From Baseline Over 65 Weeks

An adverse event is any unfavorable and unintended sign, symptom, or diagnosis that occurs in a study participant during the conduct of the study REGARDLESS of the attribution. Adverse events are graded on a scale from 1-5: 1=mild, 2=moderate, 3=severe, 4=life-threatening, 5=death. AE grading was per Division of AIDS Table for Grading the Severity of Adult and Pediatric Adverse Events (DAIDS AE Grading Table V2.1, Corrected Version 2.1, July 2017) The primary manuscript outcome measure includes data through week 65 up to September 25, 2023

Time frame:
From entry through Week 65
Reported as:
Count of participants · Participants
Participants Experiencing Any Grade 3 or Higher Adverse Event (AE) That is at Least a One Grade Increase From Baseline Over 65 Weeks
ParticipantsArm 1: ExperimentalArm 2: Standard of CareArm C: PK Only Subgroup
Number of Participants through Primary Manuscript Cutoff date of September 25, 20232653
Number of Participants through Week 652763
Statistical analysis
  • Arm 1: Experimental vs Arm 2: Standard of Care · Wald chi-square test · p = <0.01 · Risk difference (rd): 0.30 · 90% CI 0.14 to 0.45Difference in cumulative proportions (Arm 1 - Arm 2)
  • Arm 1: Experimental vs Arm 2: Standard of Care · Wald chi-square test · p = <0.01 · Risk difference (rd): 0.28 · 90% CI 0.11 to 0.44Difference in cumulative proportions (Arm 1 - Arm 2)
SecondaryProportion of Participants With Favorable Clinical/Bacteriologic Outcome (Definition A) at 65 Weeks Post-randomization

Favorable Outcome are: * liquid culture negative at week 65 * without signs or symptoms of ongoing active TB and unable to produce sputum at 65 weeks * who at the end of the follow-up period are clinically without signs/symptoms of ongoing active TB and produce a sputum specimen that is contaminated in two liquid cultures without evidence of TB Unfavorable: * Absence of cure: Having a sputum sample at or after EOT that is culture-positive (any medium) with a second positive sample obtained 4 hours following the first sample. * Death from any cause except for violent or accidental cause * Had a positive culture for Mtb when last seen * Had a treatment extension beyond nominal level due to clinically inadequate response Unevaluable are: * lost to follow-up during treatment or post-treatment with their last culture being negative for Mtb * violent or accidental death * becoming pregnant during their assigned active treatment and stop their assigned treatment.

Time frame:
From entry through Week 65
Reported as:
Number · proportion of participants
Proportion of Participants With Favorable Clinical/Bacteriologic Outcome (Definition A) at 65 Weeks Post-randomization
proportion of participantsArm 1: ExperimentalArm 2: Standard of Care
Proportion of Participants With Favorable Clinical/Bacteriologic Outcome (Definition A) at 65 Weeks Post-randomization.50 (0.35 to 0.62).76 (.56 to .88)
Statistical analysis
  • Arm 1: Experimental vs Arm 2: Standard of Care · Wald chi-square test · p = 0.01 · Risk difference (rd): -0.26 · 95% CI -0.47 to -0.06Difference in cumulative proportions (Arm 1 - Arm 2)
SecondaryProportion of Participants With Favorable Composite Outcome (Definition B) at 65 Weeks Post-randomization

Favorable Outcome are: Same as definition A Unfavorable: Same as definition A and: * lost to follow-up during treatment phase * failing to complete treatment * receiving any one or more of the following: extension of treatment beyond the nominal level, except to make up missed doses; re-starting treatment following \>= 30 consecutive days lost to follow-up; a change in at least one drug in treatment regimen for any reason except re-infection, pregnancy, or temporary drug challenge Unevaluable are: * lost to follow-up after treatment phase, and not assessable at the end of follow-up, with their last culture being negative for Mtb * Violent death or accidental death * Women who become pregnant during their assigned active treatment and stop their assigned treatment

Time frame:
From entry through Week 65
Reported as:
Number · proportion of participants
Proportion of Participants With Favorable Composite Outcome (Definition B) at 65 Weeks Post-randomization
proportion of participantsArm 1: ExperimentalArm 2: Standard of Care
Proportion of Participants With Favorable Composite Outcome (Definition B) at 65 Weeks Post-randomization0.49 (0.35 to 0.61)0.74 (0.54 to 0.86)
Statistical analysis
  • Arm 1: Experimental vs Arm 2: Standard of Care · Wald chi-square · p = 0.02 · Risk difference (rd): -0.25 · 95% CI -0.46 to -0.04Difference in cumulative proportions (Arm 1 - Arm 2)
SecondaryNumber of Participants Who Prematurely Discontinue Their Treatment Regimen Through 65 Weeks

Premature discontinuation is defined as discontinuation other than due to violent death, natural disaster, or administrative censoring

Time frame:
From entry through Week 65
Reported as:
Count of participants · Participants
Number of Participants Who Prematurely Discontinue Their Treatment Regimen Through 65 Weeks
ParticipantsArm 1: ExperimentalArm 2: Standard of Care
Number of Participants Who Prematurely Discontinue Their Treatment Regimen Through 65 Weeks23
Statistical analysis
  • Arm 1: Experimental vs Arm 2: Standard of Care · Fisher Exact · p = 0.35 · Risk difference (rd): -0.06 · 95% CI -0.22 to 0.05Difference in proportions (Arm 1 - Arm 2); exact confidence interval
SecondaryMean QTcF

QT interval measured as the average of three electrocardiogram (ECG) readings taken 5-10 minutes apart, corrected with Fridericia correction

Time frame:
Measured at Weeks 2, 8, and 13 (end of investigational treatment)
Reported as:
Mean · ms
Mean QTcF
msArm 1: ExperimentalArm 2: Standard of Care
Mean QTcF Interval at Week 2419 ± 19.4401 ± 14.8
Mean QTcF Interval at Week 8422 ± 16.8408 ± 16.8
Mean QTcF Interval at Week 13427 ± 19.5407 ± 20.4
SecondaryQTcF Interval Mean Change From Baseline

Mean change from baseline in mean QTcF at weeks 2, 8, and end of treatment (EOT)

Time frame:
Measured at baseline and Weeks 2, 8, and 13 (end of investigational treatment)
Reported as:
Mean · ms
QTcF Interval Mean Change From Baseline
msArm 1: ExperimentalArm 2: Standard of Care
Change in mean QTcF from Week 2 to Screening23.9 ± 21.20.736 ± 19.8
Change in mean QTcF from Week 8 to Screening26.5 ± 20.17.38 ± 14.6
Change in mean QTcF from Week 13 to Screening31.6 ± 20.77.77 ± 19.0
Statistical analysis
  • Arm 1: Experimental vs Arm 2: Standard of Care · Regression, Linear · p = <0.01 · Gee: 24.04 · 95% CI 15.13 to 32.94
SecondaryCategorized QTcF

Absolute QTcF was categorized as:\< 480; ≥480 ms and \<500 ms; ≥500 ms

Time frame:
Week 2, 8, and Week 13
Reported as:
Count of participants · Participants
Categorized QTcF
ParticipantsArm 1: ExperimentalArm 2: Standard of Care
Week 2 — Absolute QTcF ≥480 ms and <500 ms00
Week 2 — Absolute QTcF ≥500 ms00
Week 2 — Absolute QTcF < 480 ms5629
Week 8 — Absolute QTcF ≥480 ms and <500 ms00
Week 8 — Absolute QTcF ≥500 ms00
Week 8 — Absolute QTcF < 480 ms5431
Week 13 — Absolute QTcF ≥480 ms and <500 ms00
Week 13 — Absolute QTcF ≥500 ms00
Week 13 — Absolute QTcF < 480 ms5530
SecondaryCategorized Change From Baseline

Categorized change from baseline as: change from baseline of \<30 ms; change from baseline of ≥30 ms and \<60 ms; change from baseline of ≥60 ms

Time frame:
Measured at Weeks 2, 8, and Week 13
Reported as:
Count of participants · Participants
Categorized Change From Baseline
ParticipantsArm 1: ExperimentalArm 2: Standard of Care
Week 2 — QTcF change from baseline of ≥30 ms and <60 ms151
Week 2 — QTcF change from baseline of ≥60 ms20
Week 2 — QTcF change from baseline of <30 ms3928
Week 8 — QTcF change from baseline of ≥30 ms and <60 ms172
Week 8 — QTcF change from baseline of ≥60 ms10
Week 8 — QTcF change from baseline of <30 ms3629
Week 13 — QTcF change from baseline of ≥30 ms and <60 ms223
Week 13 — QTcF change from baseline of ≥60 ms50
Week 13 — QTcF change from baseline of <30 ms2827
Statistical analysis
  • Arm 1: Experimental vs Arm 2: Standard of Care · Regression, Logistic · p = <0.01 · Odds ratio (or): 7.15 · 95% CI 2.40 to 21.30
  • Arm 1: Experimental vs Arm 2: Standard of Care · exact unconditional · p = <0.01 · Risk difference (rd): 0.41 · 95% CI 0.17 to 0.58Arm 1 - Arm 2
SecondaryTime to Stable Culture Conversion in Liquid Media Through Week 65

Defined as the first of two (consecutive or non-consecutive) negative sputum cultures without an intervening positive culture, and/or visits wherein the participant is unable to produce sputum and has no signs of active TB

Time frame:
From entry through Week 65
Reported as:
Median · weeks
Time to Stable Culture Conversion in Liquid Media Through Week 65
weeksArm 1: ExperimentalArm 2: Standard of Care
Time to Stable Culture Conversion in Liquid Media Through Week 656 (4 to 8)8 (6 to 10)
Statistical analysis
  • Arm 1: Experimental vs Arm 2: Standard of Care · Regression, Cox · p = 0.18 (One-sided p-value) · Hazard ratio (hr): 1.23 · 90% CI 0.84 to 1.80Arm 1 vs. Arm 2
SecondaryTime to Stable Culture Conversion in Solid Media Through Week 65

The time of stable culture conversion was the visit corresponding to the first of two consecutive negative cultures without an intervening positive, and/or visits wherein the participant was unable to produce sputum and had no signs of active TB. If a participant did not culture convert, they were censored at their last culture result (regardless of result). If a participant died before conversion, the death was considered as a competing event. Participants who were lost to follow-up prior to 65 weeks with their last culture being positive were censored at 65 weeks (i.e. assumed they did not have a culture conversion by week 65), and participants who were lost to follow-up prior to 65 weeks with their last culture being negative were censored at the last sampling visit for which they had a valid culture result. Adjusted model adjusts for HIV-1 status (positive/negative) and TB Disease at Screening (Advanced/Not Advanced).

Time frame:
From entry through Week 65
Reported as:
Median · weeks
Time to Stable Culture Conversion in Solid Media Through Week 65
weeksArm 1: ExperimentalArm 2: Standard of Care
Time to Stable Culture Conversion in Solid Media Through Week 656 (2 to 8)6 (4 to 8)
Statistical analysis
  • Arm 1: Experimental vs Arm 2: Standard of Care · Regression, Cox · p = 0.25 (One-sided p-value) · Hazard ratio (hr): 1.17 · 90% CI 0.80 to 1.71
SecondaryNumber of Participants Achieving Stable Liquid Culture Conversion by Week 8

Defined as the first of two (consecutive or non-consecutive) negative sputum cultures without an intervening positive culture, and/or visits wherein the participant is unable to produce sputum and has no signs of active TB

Time frame:
From entry through Week 8
Reported as:
Count of participants · Participants
Number of Participants Achieving Stable Liquid Culture Conversion by Week 8
ParticipantsArm 1: ExperimentalArm 2: Standard of Care
Number of Participants Achieving Stable Liquid Culture Conversion by Week 84119
Statistical analysis
  • Arm 1: Experimental vs Arm 2: Standard of Care · Fisher Exact · p = 0.23 · Risk difference (rd): 0.13 · 95% CI -0.07 to 0.35
SecondaryNumber of Participants Achieving Stable Solid Culture Conversion by Week 8

Defined as the first of two (consecutive or non-consecutive) negative sputum cultures without an intervening positive culture, and/or visits wherein the participant is unable to produce sputum and has no signs of active TB

Time frame:
From entry through Week 8
Reported as:
Count of participants · Participants
Number of Participants Achieving Stable Solid Culture Conversion by Week 8
ParticipantsArm 1: ExperimentalArm 2: Standard of Care
Number of Participants Achieving Stable Solid Culture Conversion by Week 84725
Statistical analysis
  • Arm 1: Experimental vs Arm 2: Standard of Care · Fisher Exact · p = 0.56 · Risk difference (rd): 0.05 · 95% CI -0.11 to 0.24
SecondaryNumber of Participants With One or More Serious Adverse Events (SAEs)

Cumulative proportion with at least one Serious Adverse Event (SAE) A SAE is defined as any untoward medical occurrence that: * Results in death * Is life-threatening * Requires inpatient hospitalization or prolongation of existing hospitalization * Results in persistent or significant disability/incapacity * Is a congenital anomaly/birth defect * Is an important medical event that many not be immediately life-threatening or result in death or hospitalization but may jeopardize the patient or may require intervention to prevent one of the other outcomes listed in the definition above.

Time frame:
From entry through Week 65
Reported as:
Count of participants · Participants
Number of Participants With One or More Serious Adverse Events (SAEs)
ParticipantsArm 1: ExperimentalArm 2: Standard of CareArm C: PK Only Subgroup
Number of Participants With One or More Serious Adverse Events (SAEs)822
Statistical analysis
  • Arm 1: Experimental vs Arm 2: Standard of Care · Wald chi-square test · p = 0.27 · Risk difference (rd): 0.07 · 90% CI -0.04 to 0.18Difference in cumulative proportions (Arm 1 - Arm 2)
SecondaryNumber of Participants Achieving Stable Solid Culture Conversion by Week 12

Defined as the first of two (consecutive or non-consecutive) negative sputum cultures without an intervening positive culture, and/or visits wherein the participant is unable to produce sputum and has no signs of active TB

Time frame:
From entry through Week 12
Reported as:
Count of participants · Participants
Number of Participants Achieving Stable Solid Culture Conversion by Week 12
ParticipantsArm 1: ExperimentalArm 2: Standard of Care
Number of Participants Achieving Stable Solid Culture Conversion by Week 125330
Statistical analysis
  • Arm 1: Experimental vs Arm 2: Standard of Care · Fisher Exact · p = 1 · Risk difference (rd): -0 · 95% CI -0.10 to 0.13Difference in proportions (Arm 1 - Arm 2); exact confidence interval
SecondaryMedian Time (Days) to Positivity in Liquid Culture (MGIT)

Time (days) to positivity in liquid culture (MGIT) is defined as the number of days it takes for the culture to produce results up to a max of 42 days. For negative culture results, time to positivity is imputed as 42 days.

Time frame:
From screening, entry, weeks 1, 2, 3, 4, 6, 8, 10, 12
Reported as:
Median · days
Median Time (Days) to Positivity in Liquid Culture (MGIT)
daysArm 1: ExperimentalArm 2: Standard of Care
Screening Time to Positivity6.17 (3.83 to 7.67)5.67 (4.04 to 8.08)
Entry Time to Positivity8.63 (6.67 to 11.2)8.23 (7.21 to 10.3)
Week 1 Time to Positivity12.8 (7.33 to 18.3)—
Week 2 Time to Positivity16.8 (11.8 to 22.4)12.1 (9.96 to 18.9)
Week 3 Time to Positivity20.2 (8.29 to 42)—
Week 4 Time to Positivity25.1 (16.8 to 42)16.5 (14.4 to 38)
Week 6 Time to Positivity42 (27.2 to 42)42 (17.6 to 42)
Week 8 Time to Positivity42 (42 to 42)42 (26.7 to 42)
Week 10 Time to Positivity42 (42 to 42)42 (42 to 42)
Week 12 Time to Positivity42 (42 to 42)42 (42 to 42)
Statistical analysis
  • Arm 1: Experimental vs Arm 2: Standard of Care · Regression, Cox · p = 0.597 · Hazard ratio (hr): 0.89 · 95% CI 0.57 to 1.39
  • Arm 1: Experimental vs Arm 2: Standard of Care · Regression, Cox · p = 0.70 · Hazard ratio (hr): 0.92 · 95% CI 0.58 to 1.44
  • Arm 1: Experimental vs Arm 2: Standard of Care · Regression, Cox · p = 0.07 · Hazard ratio (hr): 0.64 · 95% CI 0.40 to 1.03
  • Arm 1: Experimental vs Arm 2: Standard of Care · Regression, Cox · p = 0.04 · Hazard ratio (hr): 0.58 · 95% CI 0.34 to 0.98
  • Arm 1: Experimental vs Arm 2: Standard of Care · Regression, Cox · p = 0.60 · Hazard ratio (hr): 0.83 · 95% CI 0.41 to 1.67
  • Arm 1: Experimental vs Arm 2: Standard of Care · Regression, Cox · p = 0.595 · Hazard ratio (hr): 0.79 · 95% CI 0.33 to 1.88
  • Arm 1: Experimental vs Arm 2: Standard of Care · Regression, Cox · p = 0.66 · Hazard ratio (hr): 0.78 · 95% CI 0.25 to 2.44
  • Arm 1: Experimental vs Arm 2: Standard of Care · Regression, Cox · p = 0.86 · Hazard ratio (hr): 1.17 · 95% CI 0.21 to 6.39
SecondaryChange in Chest X-ray Score From Baseline to End of Treatment in Each Arm

The chest X-ray was posterior-anterior. Extent of disease (limited to one lobe or region, unilateral, bilateral, or diffuse) and cavitation status (cavities present \[location\] or absent) was documented by validated numerical score (percent of total lung affected by any pathology + 40 if cavitation is present; 0 = No percent affected, 140 = entire lung is affected + cavitation is present) for grading chest X-ray in adult smear-positive pulmonary TB (Thorax 2010; 65(10):863-9). Analysis was conducted based on site readings of CXR

Time frame:
Entry, End of Treatment (Week 13 for Arm 1 and Week 26 for Arm 2)
Reported as:
Mean · score on a scale
Change in Chest X-ray Score From Baseline to End of Treatment in Each Arm
score on a scaleArm 1: ExperimentalArm 2: Standard of Care
Change in Chest X-ray Score From Baseline to End of Treatment in Each Arm-25.51 (-34.27 to -16.75)-46.10 (-58.04 to -34.16)
Statistical analysis
  • Arm 1: Experimental vs Arm 2: Standard of Care · Regression, Linear · p = <0.01 · Slope: 20.43 · 95% CI 5.71 to 35.16
SecondaryProportion of Participants Who Have a TB Relapse, From End of Treatment Until Week 65

The time of relapse is defined as the time from end of treatment until the first sputum sample that is culture positive in liquid or solid media for an Mtb strain that has matching genotype with the baseline isolate (as determined by whole genome sequencing). A second positive sputum sample obtained at least 4 hours following the first sputum collection is required to confirm a relapse. If the second sputum sample was negative, this was not counted as a relapse. If a participant was lost to follow-up without a second sputum sample confirmation of relapse (including contaminated or missing), it was counted as a relapse. Whole genome sequencing of samples, which is necessary to assess TB relapse, was not performed due to lack of funding. There is no plan to test these samples in the future.

Time frame:
From end of treatment (week 13 for Arm 1; week 26 for Arm 2) to week 65

No measurements were reported for this outcome.

SecondaryCumulative Proportion of Participants Who Have a TB Recurrence, From End of Treatment Until Week 65

The time of recurrence is defined as the time from end of treatment until the first sputum sample that is culture positive in liquid or solid media. A second positive sputum sample obtained at least 4 hours following the first sputum collection is required to confirm a recurrence. If the second sputum sample was negative, this will not be counted as a recurrence. If a participant was lost to follow-up without a second sputum sample confirmation of recurrence (including contaminated or missing), it was counted as a recurrence. Participants at risk for recurrence where those who were stable culture conversions by end of treatment.

Time frame:
From end of treatment (week 13 for Arm 1; week 26 for Arm 2) to week 65
Reported as:
Number · proportion of participants
Cumulative Proportion of Participants Who Have a TB Recurrence, From End of Treatment Until Week 65
proportion of participantsArm 1: ExperimentalArm 2: Standard of Care
Within 26 Weeks of Treatment Completion0.21 (0.12 to 0.35)0.04 (0.01 to 0.24)
Within 39 Weeks of Treatment Completion0.23 (0.13 to 0.37)0.04 (0.01 to 0.24)
Within 52Weeks of Treatment Completion0.23 (0.13 to 0.37)—
SecondaryPharmacokinetic Parameter for CFZ: Minimum Concentration (Cmin)

Estimated using noncompartmental methods applied to concentrations from intensive PK sampling visits at weeks 2 and 13.

Time frame:
Measured at Weeks 2 and 13
Reported as:
Mean · mg/L
Pharmacokinetic Parameter for CFZ: Minimum Concentration (Cmin)
mg/LArm 1: ExperimentalArm C: PK Only Subgroup
Week 20.473 ± 0.1810.169 ± 0.088
Week 130.594 ± 0.197—
SecondaryPharmacokinetic Parameter for CFZ: Maximum Concentration (Cmax)

Estimated using noncompartmental methods applied to concentrations from intensive PK sampling visits at weeks 2 and 13.

Time frame:
Measured at Weeks 2 and 13
Reported as:
Mean · mg/L
Pharmacokinetic Parameter for CFZ: Maximum Concentration (Cmax)
mg/LArm 1: ExperimentalArm C: PK Only Subgroup
Week 20.861 ± 0.2860.277 ± 0.123
Week 130.819 ± 0.247—
SecondaryPharmacokinetic Parameter for CFZ: Time of Cmax (Tmax)

Estimated using noncompartmental methods applied to concentrations from intensive PK sampling visits at weeks 2 and 13.

Time frame:
Measured at Weeks 2 and 13
Reported as:
Mean · hours
Pharmacokinetic Parameter for CFZ: Time of Cmax (Tmax)
hoursArm 1: ExperimentalArm C: PK Only Subgroup
Week 24.97 ± 2.107.74 ± 4.90
Week 137.27 ± 4.68—
SecondaryPharmacokinetic Parameter for CFZ: Area Under the Concentration Curve (AUC0-24h)

Estimated using noncompartmental methods applied to concentrations from intensive PK sampling visits at weeks 2 and 13.

Time frame:
Measured at Weeks 2 and 13
Reported as:
Mean · mg/L*h
Pharmacokinetic Parameter for CFZ: Area Under the Concentration Curve (AUC0-24h)
mg/L*hArm 1: ExperimentalArm C: PK Only Subgroup
Week 215.6 ± 5.585.42 ± 2.48
Week 1316.9 ± 5.57—
SecondaryMean Change From Baseline in Skin Pigmentation (Colorimetric L*)

The median of triplicate measurements of Inner Arm, and Face (median of all measurements from the Chin, Forehead, Left Cheek, and Right Cheek). L represents lightness (0 = black, 100 = white). Further data processing removed values if one of the triplicates differed more than 5% of the median.

Time frame:
Entry, Weeks 8, 13, 26, and 65
Reported as:
Mean · units on a scale
Mean Change From Baseline in Skin Pigmentation (Colorimetric L*)
units on a scaleArm 1: ExperimentalArm 2: Standard of Care
Inner Arm - Week 8-2.54 ± 2.51-1.65 ± 2.17
Inner Arm - Week 13-4.72 ± 3.10.02 ± 2.74
Inner Arm - Week 26-2.8 ± 3-0.68 ± 2.54
Inner Arm - Week 65-1.15 ± 3.451.19 ± 3.52
Face - Week 8-3 ± 2.30-0.96 ± 2.16
Face - Week 13-3.61 ± 2.86-0.51 ± 1.97
Face - Week 26-2.65 ± 2.5-0.43 ± 2.16
Face - Week 65-0.45 ± 2.960.34 ± 2.31
SecondaryMean Change From Baseline in Skin Pigmentation (Colorimetric a*)

The median of triplicate measurements of Inner Arm, and Face (median of all measurements from the Chin, Forehead, Left Cheek, and Right Cheek). The a\* parameter represents the balance between red and green. Positive values of a\* indicate a reddish tone, while negative values indicate a greenish tone. (-128 = Green, 127 = Red). Further data processing removed values if one of the triplicates differed more than 5% of the median.

Time frame:
Entry, Weeks 8, 13, 26, and 65
Reported as:
Mean · units on a scale
Mean Change From Baseline in Skin Pigmentation (Colorimetric a*)
units on a scaleArm 1: ExperimentalArm 2: Standard of Care
Inner Arm - Week 80.23 ± 5.86.20 ± 2.44
Inner Arm - Week 132.14 ± 8.61-0.34 ± 6.40
Inner Arm - Week 26-1.09 ± 5.72-1.01 ± 4.97
Inner Arm - Week 65-0.96 ± 5.51-1.37 ± 5.96
Face - Week 8-0.58 ± 1.86-0.09 ± 3.77
Face - Week 13-0.46 ± 2.99-0.28 ± 1.19
Face - Week 26-0.66 ± 1.71-0.43 ± 1.56
Face - Week 65-0.23 ± 2.200.23 ± 2.01
SecondaryMean Change From Baseline in Skin Pigmentation (Colorimetric b*)

The median of triplicate measurements of Inner Arm, and Face (median of all measurements from the Chin, Forehead, Left Cheek, and Right Cheek). The b\* parameter represents the balance between yellow and blue. Positive values of b\* indicate a yellowish tone, while negative values indicate a bluish tone (-128 = Blue, 127 = Yellow). Further data processing removed values if one of the triplicates differed more than 5% of the median.

Time frame:
Entry, Weeks 8, 13, 26, and 65
Reported as:
Mean · units on a scale
Mean Change From Baseline in Skin Pigmentation (Colorimetric b*)
units on a scaleArm 1: ExperimentalArm 2: Standard of Care
Inner Arm - Week 8-1.62 ± 3.49-1.21 ± 3.07
Inner Arm - Week 13-2.27 ± 3.380.11 ± 4.28
Inner Arm - Week 26-1.52 ± 4.50-0.71 ± 3.86
Inner Arm - Week 65-1.70 ± 3.37-1.29 ± 4.06
Face - Week 8-2.48 ± 2.15-0.82 ± 2.97
Face - Week 13-2.65 ± 2.75-0.66 ± 2.44
Face - Week 26-2.44 ± 2.89-0.92 ± 2.55
Face - Week 65-1.72 ± 2.52-0.88 ± 2.17
SecondaryChange From Baseline in Participant-reported Changes in Skin Pigment Related to Perceived Skin Hyperpigmentation

Subjective questionnaire asked the following questions : 1.) On a scale from 0 to 10: (0 being none and 10 being most significant possible) How would you rate any change in the coloration of your skin since you began TB treatment?

Time frame:
Entry, Weeks 8, 13, 26, and 65
Reported as:
Mean · score on a scale
Change From Baseline in Participant-reported Changes in Skin Pigment Related to Perceived Skin Hyperpigmentation
score on a scaleArm 1: ExperimentalArm 2: Standard of Care
Week 81.60 ± 2.650.53 ± 1.11
Week 132.15 ± 2.650.17 ± 0.54
Week 260.53 ± 1.410.79 ± 1.95
Week 650.25 ± 1.600.38 ± 1.68
SecondaryChange From Baseline in Participant-reported Distress Caused by Change in Skin Pigment Related to Perceived Skin Hyperpigmentation

Subjective questionnaire asked the following questions: On a scale from 0 to 10: (0 being none and 10 being worst possible) How would you rate your distress to skin coloration changes since you began TB treatment, if any?

Time frame:
Entry, Weeks 8, 13, 26, and 65
Reported as:
Mean · score on a scale
Change From Baseline in Participant-reported Distress Caused by Change in Skin Pigment Related to Perceived Skin Hyperpigmentation
score on a scaleArm 1: ExperimentalArm 2: Standard of Care
Week 81.02 ± 2.480.17 ± 0.75
Week 130.89 ± 2.01-0.07 ± 0.26
Week 260.21 ± 1.520.07 ± 0.80
Week 650.21 ± 1.700.15 ± 0.88

Adverse events

Collected over From entry through study completion, up to 117 weeks. Non-serious events are listed at a 0% frequency threshold.

Adverse event summary by group
GroupDeathsSeriousOther
Arm 11/58 (1.7%)8/58 (13.8%)25/58 (43.1%)
Arm 21/31 (3.2%)2/31 (6.5%)7/31 (22.6%)
Arm C1/15 (6.7%)2/15 (13.3%)3/15 (20%)
Arm 1 (Extension of Follow-up)0/29 (0%)2/29 (6.9%)1/29 (3.4%)
Most frequent serious events
Showing 10 of 21
Most frequent serious events
EventArm 1Arm 2Arm CArm 1 (Extension of Follow-up)
Disseminated tuberculosisInfections and infestations0/580/311/150/29
Alanine aminotransferase increasedInvestigations1/580/311/150/29
Aspartate aminotransferase increasedInvestigations1/580/311/150/29
Bilirubin conjugated increasedInvestigations0/580/311/150/29
Small intestinal obstructionGastrointestinal disorders0/580/310/151/29
Blood bilirubin increasedInvestigations2/580/310/150/29
Diabetes mellitus inadequate controlMetabolism and nutrition disorders0/580/310/151/29
Cerebral toxoplasmosisInfections and infestations0/581/310/150/29
Immune reconstitution inflammatory syndrome associated tuberculosisInfections and infestations0/581/310/150/29
Gun shot woundInjury, poisoning and procedural complications0/581/310/150/29
Most frequent other events
Showing 10 of 22
Most frequent other events
EventArm 1Arm 2Arm CArm 1 (Extension of Follow-up)
Blood creatinine increasedInvestigations14/583/310/150/29
Aspartate aminotransferase increasedInvestigations4/581/311/150/29
Chest painGeneral disorders0/580/311/150/29
Alanine aminotransferase increasedInvestigations1/580/311/150/29
Bilirubin conjugated increasedInvestigations0/580/311/150/29
Abnormal loss of weightMetabolism and nutrition disorders1/580/311/150/29
HypertensionVascular disorders0/580/311/150/29
AnaemiaBlood and lymphatic system disorders2/580/310/150/29
Blood glucose increasedInvestigations1/580/310/151/29
Pulmonary tuberculosisInfections and infestations0/581/310/150/29

Baseline characteristics

Age, Continuous
Age, Continuous(years)Arm 1: ExperimentalArm 2: Standard of CareArm C: PK Only SubgroupTotal
Median33 (27 to 39)30 (24 to 38)35 (31 to 43)33 (27 to 39)
Sex: Female, Male
Sex: Female, Male(Participants)Arm 1: ExperimentalArm 2: Standard of CareArm C: PK Only SubgroupTotal
Female119222
Male47221382
Ethnicity (NIH/OMB)
Ethnicity (NIH/OMB)(Participants)Arm 1: ExperimentalArm 2: Standard of CareArm C: PK Only SubgroupTotal
Hispanic or Latino0000
Not Hispanic or Latino49261590
Unknown or Not Reported95014
Race/Ethnicity, Customized
Race/Ethnicity, Customized(Participants)Arm 1: ExperimentalArm 2: Standard of CareArm C: PK Only SubgroupTotal
ASIAN96015
BLACK OR AFRICAN AMERICAN49251589
Region of Enrollment
Region of Enrollment(participants)Arm 1: ExperimentalArm 2: Standard of CareArm C: PK Only SubgroupTotal
Haiti2204
India95014
Malawi2611946
South Africa116320
Zimbabwe107320
08

Study locations

6 sites
  • Les Centres GHESKIO Clinical Research Site (GHESKIO-INLR) CRS
    Port-au-Prince, HT-6110, Haiti
  • Byramjee Jeejeebhoy Medical College (BJMC) CRS
    Pune, 411001, India
  • Malawi CRS
    Lilongwe, Central Region, Malawi
  • Blantyre CRS
    Blantyre, 1131, Malawi
  • CAPRISA eThekwini CRS
    Durban, KwaZulu-Natal 4013, South Africa
  • Milton Park CRS
    Harare, Zimbabwe
09

References and documents

Publications

  • Mugodhi F, Kanyama C, Makiya F, Metcalfe J, Potani C, Scarsi KK, Weir I, Furin J. "Six months is a lot of time to lie": Anticipated stigma, disclosure and treatment preferences among participants in a tuberculosis therapeutic trial. Res Sq [Preprint]. 2025 Dec 22:rs.3.rs-8277920. doi: 10.21203/rs.3.rs-8277920/v1. PubMed 41510291 ↗
  • Metcalfe JZ, Weir IR, Scarsi KK, Mendoza-Ticona A, Pierre S, Hall L, Leon-Cruz J, Svensson EM, Koele SE, Samaneka W, Kanyama C, Yohane M, Nevrekar N, Ntsalaze B, Marc JB, Goth M, Maartens G, Chaisson R; ACTG A5362 study team. A 3-month clofazimine-rifapentine-containing regimen for drug-susceptible tuberculosis versus standard of care (Clo-Fast): a randomised, open-label, phase 2c clinical trial. Lancet Infect Dis. 2026 Jan;26(1):46-54. doi: 10.1016/S1473-3099(25)00436-0. Epub 2025 Sep 4. PubMed 40915311 ↗

Study documents

PDFs hosted by the registry, ClinicalTrials.gov.

Individual participant data

Plan to share: Yes — Individual participant data that underlie results in the publication, after deidentification.

Supporting information: Study protocol, Statistical analysis plan

Time frame: Beginning 3 months following publication and available throughout period of funding of the Advancing Clinical Therapeutics Globally for HIV/AIDS and Other Infections (ACTG) Network by NIH.

Access criteria: With whom? Researchers who provide a methodologically sound proposal for use of the data that is approved by the ACTG. For what types of analyses? To achieve aims in the proposal approved by the ACTG Group. By what mechanism will data be made available? Researchers may submit a request for access to data using the ACTG "Data Request" form at: https://submit.mis.s-3.net/ Researchers of approved proposals will need to sign an ACTG Data Use Agreement before receiving the data.

10

Timeline

Tracking since Sep 25, 2026
ElapsedEstimatedEstimated, not yet reached

Ran from Nov 2021 to primary completion in Jun 2024, 31 months.

Results were first posted in Aug 2025, 1 year 2 months after primary completion.

How these figures are worked out, and which studies are left out of them.

Registered
Mar 5, 2020
First posted
Mar 17, 2020
StartActual
Nov 5, 2021
Primary completionActual
Jun 24, 2024
CompletionActual
Jun 24, 2025
Results first posted
Aug 27, 2025
Last update
Jul 8, 2026
What these dates mean
Start.
When the first participant enrolled; while estimated, when the study expects to open to recruitment.
Primary completion.
When the last participant was examined or treated to collect data for the study's main question, its primary outcome. A study that stopped early gives the date its data collection stopped.
Completion.
When the last participant's last visit took place, for every outcome, secondary ones and side effects included: the end of the study. Often later than primary completion, sometimes the same day.
Actual and Est.
Actual means the registry says the date has happened. Est. (estimated) is a date the sponsor plans or expects. It can still move, and the sponsor is expected to change it to actual once it has passed.
No changes since tracking began. The registry record was last updated on Jul 8, 2026, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
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Registry details

Key details

Study ID
NCT04311502
Responsible party
Sponsor
First posted
Mar 17, 2020
Start date
Nov 5, 2021
Primary completion
Jun 24, 2024
Completion
Jun 24, 2025
Results posted
Aug 27, 2025
Last update
Jul 8, 2026

Study contacts

John Metcalfe, MD, PhD, MPH
study chair · University of California, San Francisco

Oversight

Data monitoring committee
Yes
FDA-regulated drug
Yes
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

Not currently enrolling

This study is terminated, as verified in Jun 2026. You cannot join it, but the record below documents what was studied.

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Discussion

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Studies of the drugs tested here: Rifapentine · Clofazimine

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