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Tuberculosis Clinical Trials Consortium Study 35

Primary Purpose

Latent Tuberculosis

Status
Recruiting
Phase
Phase 1
Locations
South Africa
Study Type
Interventional
Intervention
Rifapentine
Isoniazid
Sponsored by
Centers for Disease Control and Prevention
About
Eligibility
Locations
Arms
Outcomes
Full info

About this trial

This is an interventional prevention trial for Latent Tuberculosis

Eligibility Criteria

0 Years - 12 Years (Child)All SexesAccepts Healthy Volunteers

Inclusion Criteria:

  1. Aged 0 - 12 years
  2. Documented close (household or other close exposure) for at least an average 4 hours a day over the past 6 months to a bacteriologically confirmed adult (18 years or older) source case with pulmonary TB. The adult TB source case should have confirmed drug sensitive (sputum culture confirmed or XPERT MTB/Rif [Cepheid] positive TB and without any evidence of drug resistance, i.e., at least XPERT MTB/Rif rifampicin susceptible or an alternative molecular or phenotypic test indicating rifampicin susceptible M. tb) OR:
  3. Evidence of M. tb infection (positive TST ≥ 10 mm in HIV-uninfected and TST ≥ 5 mm in HIV-infected participants or a positive commercial interferon-gamma release assay, as defined by the manufacturer)
  4. Confirmed HIV status:

    HIV status will be confirmed by DNA PCR and Plasma HIV-RNA if the participant is <18 months of age.

    In participants ≥18 month of age HIV-ELISA testing will be completed. If any HIV test is positive in a child participant, regardless of age, the test result needs to be confirmed with a second HIV test, using HIV DNA or RNA PCR, from an independent sample.

  5. HIV-infected participants should be on an ART regimen for at least 12 weeks prior to enrolment and should be clinically stable before entering the study, regardless of CD 4 count and HIV viral load. While on study, participants must be on an efavirenz- or raltegravir-based ART regimen which should have been given for at least 14 days prior to enrolment.
  6. Caregiver (parent or legal guardian) gives written informed consent and assent from the child where applicable
  7. Weight > 2.5 kg but < 40 kg

Exclusion Criteria:

  1. Active TB disease (evidenced by: symptoms suggestive of TB, or suggestive findings on clinical examination, or suggestive chest radiographic findings, or positive mycobacterial culture/molecular TB tests -if culture/molecular testing was clinically indicated and was completed-, or currently on TB treatment for active disease).
  2. Any documented drug resistant TB (DR TB) in an identified adult source case, defined as rifampicin resistance on Xpert or any other relevant approved molecular test, or phenotypic evidence of rifampicin resistance.
  3. Receipt of a once-daily isoniazid regimen for > 30 days which was given for at least 14 consecutive days in the 30 days prior to enrolment.
  4. Hb < 10 mg/dl
  5. Weight for age z score below 2 or severe clinical malnutrition
  6. Known allergy or hypersensitivity to isoniazid or rifapentine
  7. Documented hepatic disorder including > 5 fold elevated upper limit of normal (ULN) ALT and/or bilirubin
  8. Lansky play score < 50
  9. Documentation of Hepatitis A or B infection
  10. Female adolescents who have reached menarche will not be eligible.

Sites / Locations

  • Desmond Tutu TB Center, University of StellenboschRecruiting

Arms of the Study

Arm 1

Arm Type

Experimental

Arm Label

Single Arm Rifapentine and Isoniazid

Arm Description

Single arm, open label and exposure-controlled. Intervention is rifapentine given in a new fixed dose combination once-weekly, in combination with isoniazid for 12 weeks, in HIV-infected and HIV-uninfected children aged 0-12 years in whom LTBI treatment is indicated. The protocol allows for parallel enrolment of children into cohorts 1 and 2, simultaneously, using a predetermined modeled initial dose for each cohort, separately. Similarly, cohorts 3 and 4 will be enrolled in parallel, using modeled doses for each cohort, based on data from cohorts 1 and 2 and historical data from TBTC trials.

Outcomes

Primary Outcome Measures

Rifapentine exposure among participants by median area under the curve (AUC)
Target AUC is no more than 25% lower than, and no more than 75% higher than, the target AUC of 522 mcg*h/L. Data to be used for dose adjustments throughout the study and to create dosing algorithm for pediatric subgroups.

Secondary Outcome Measures

Number of participants with Grade 3 or 4 adverse events
Cumulative number will be reported
Proportion of participants with Grade 3 or 4 adverse events
Cumulative proportion will be reported
Number of participants who discontinue study drug due to an adverse event
Cumulative number will be reported
Proportion of participants who discontinue study drug due to an adverse event
Cumulative proportion will be reported
Estimation of rifapentine absorption rate constant (ka) from plasma drug levels
Absorption rate constant will be estimated from plasma rifapentine blood levels, using population pharmacokinetic modeling methods. Models will be controlled for between-subject variability terms such as age and weight.
Estimation of rifapentine volume of distribution (Vd) from plasma drug levels
Volume of distribution will be estimated from plasma rifapentine blood levels, using population pharmacokinetic modeling methods. Models will be controlled for between-subject variability terms such as age and weight.
Estimation of rifapentine oral clearance (Cl/F) from plasma drug levels
Oral clearance will be estimated from plasma rifapentine blood levels, using population pharmacokinetic modeling methods. Models will be controlled for between-subject variability terms such as age and weight.
Post-hoc Bayesian prediction of rifapentine and metabolite peak concentration (Cmax)
Peak concentration will be predicted from plasma rifapentine and metabolite blood levels, using population pharmacokinetic modeling methods.
Post-hoc Bayesian prediction of rifapentine and metabolite time to peak concentration (Tmax)
Time to peak concentration will be predicted from plasma rifapentine and metabolite blood levels, using population pharmacokinetic modeling methods.
Post-hoc Bayesian prediction of rifapentine and metabolite area-under-the-curve (AUC0-24)
Area-under-the-curve will be predicted from plasma rifapentine and metabolite blood levels, using population pharmacokinetic modeling methods.
Post-hoc Bayesian prediction of rifapentine and metabolite half life (t 1/2)
Half life will be predicted from plasma rifapentine and metabolite blood levels, using population pharmacokinetic modeling methods.
Palatability scores
Using a standard validated Wong-Baker Faces tool which is a tool developed to help children communicate pain. For this outcome, the scale has been adapted to communicate like and dislike, and in-depth interviews
Acceptability scores
Using a standard validated Wong-Baker Faces tool which is a tool developed to help children communicate pain. For this outcome, the scale has been adapted to communicate like and dislike, and in-depth interviews
Incidence of tuberculosis
frequency of incident tuberculosis will be reported
Estimation of isoniazid absorption rate constant (ka) from plasma drug levels
Absorption rate constant will be estimated from plasma isoniazid blood levels, using population pharmacokinetic modeling methods. Models will be controlled for N-acetyltransferase 2 (NAT2) metabolizer genotype
Estimation of isoniazid volume of distribution (Vd) from plasma drug levels
Volume of distribution will be estimated from plasma isoniazid blood levels, using population pharmacokinetic modeling methods. Models will be controlled for N-acetyltransferase 2 (NAT2) metabolizer genotype
Estimation of isoniazid oral clearance (Cl/F) from plasma drug levels
Oral clearance will be estimated from plasma isoniazid blood levels, using population pharmacokinetic modeling methods. Models will be controlled for N-acetyltransferase 2 (NAT2) metabolizer genotype
Post-hoc Bayesian prediction of isoniazid peak concentration (Cmax)
Peak concentration will be predicted from plasma isoniazid blood levels, using population pharmacokinetic modeling methods, and accounting for N-acetyltransferase 2 (NAT2) metabolizer genotype
Post-hoc Bayesian prediction of isoniazid time to peak concentration (Tmax)
Time to peak concentration will be predicted from plasma isoniazid blood levels, using population pharmacokinetic modeling methods, and accounting for N-acetyltransferase 2 (NAT2) metabolizer genotype
Post-hoc Bayesian prediction of isoniazid area-under-the-curve (AUC0-24)
Area-under-the-curve will be predicted from plasma isoniazid blood levels, using population pharmacokinetic modeling methods, and accounting for N-acetyltransferase 2 (NAT2) metabolizer genotype
Post-hoc Bayesian prediction of isoniazid half life (t 1/2)
Half life will be predicted from plasma isoniazid blood levels, using population pharmacokinetic modeling methods, and accounting for N-acetyltransferase 2 (NAT2) metabolizer genotype

Full Information

First Posted
October 12, 2018
Last Updated
August 31, 2023
Sponsor
Centers for Disease Control and Prevention
Collaborators
University of Stellenbosch, Johns Hopkins University, Sanofi, University of Cape Town, Chris Hani Baragwanath Academic Hospital, Washington D.C. Veterans Affairs Medical Center
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1. Study Identification

Unique Protocol Identification Number
NCT03730181
Brief Title
Tuberculosis Clinical Trials Consortium Study 35
Official Title
Phase I/II Dose Finding and Safety Study of Rifapentine and Isoniazid in HIV-Infected and HIV-Uninfected Children With Latent Tuberculosis Infection
Study Type
Interventional

2. Study Status

Record Verification Date
August 2023
Overall Recruitment Status
Recruiting
Study Start Date
October 12, 2019 (Actual)
Primary Completion Date
July 2024 (Anticipated)
Study Completion Date
December 2024 (Anticipated)

3. Sponsor/Collaborators

Responsible Party, by Official Title
Sponsor
Name of the Sponsor
Centers for Disease Control and Prevention
Collaborators
University of Stellenbosch, Johns Hopkins University, Sanofi, University of Cape Town, Chris Hani Baragwanath Academic Hospital, Washington D.C. Veterans Affairs Medical Center

4. Oversight

Studies a U.S. FDA-regulated Drug Product
Yes
Studies a U.S. FDA-regulated Device Product
No
Data Monitoring Committee
Yes

5. Study Description

Brief Summary
Hypotheses: Rifapentine (given as water-dispersible monolayer and/or fixed dose combination with isoniazid) dosing in HIV-infected and uninfected children ≤ 12 years of age with latent TB infection (LTBI) or with exposure to Mycobacterium tuberculosis (M. tuberculosis) will require higher mg/kg rifapentine dosing than adults to achieve adult- exposures which are correlated with efficacy in trials of TB prevention. Investigators further hypothesize that rifapentine will be safe and well-tolerated in HIV-infected and uninfected children who require treatment for LTBI.
Detailed Description
Design: Tuberculosis Trials Consortium Study 35 (TBTC S35) is a Phase I/II, open-label, single arm, exposure-controlled dose finding study using an adaptive design. S35 will evaluate the pharmacokinetics (PK), safety and tolerability of rifapentine given in a new fixed dose combination once-weekly, in combination with isoniazid for 12 weeks, in HIV-infected and HIV-uninfected children aged 0-12 years in whom LTBI treatment is indicated. The study utilizes a modified age de-escalation approach given the extensive PK and safety data already available in children older than 2 years of age. The protocol allows for parallel enrolment of children into cohorts 1 and 2, simultaneously, using a predetermined modeled initial dose for each cohort, separately. Similarly, cohorts 3 and 4 will be enrolled in parallel, using modeled doses for each cohort, based on data from cohorts 1 and 2 and historical data from TBTC trials. Sample Size: Approximately 72 participants will be required to ensure a minimum number of 60 evaluable participants. Participants will be enrolled in 4 age cohorts: Cohort 1: ≥ 4 to ≤ 12 years Cohort 2: ≥ 24 months to < 4 years Cohort 3: ≥ 12 to < 24 months Cohort 4: 0 to <12 months There will be a minimum of 12 participants each in cohorts 1 and 2, and 18 participants each in cohorts 3 and 4, to allow for 36 participants in the age group below 2 years, given the importance of developmental pharmacology in this youngest age group (Table 1) and the lack of historical data in this age group. Cohorts 3 and 4 will be enrolled once week 1 PK and safety data is available in cohorts 1 and 2. Up to 18 HIV-infected children overall will be enrolled, with a target of 12 HIV-infected children overall. It is expected that most HIV-infected children will be > 3 years of age given current international recommendations regarding the use of efavirenz in children in international settings, where the study will be conducted. However, it is expected that integrase inhibitors (e.g. raltegravir) would become more routinely available during the study period, allowing younger HIV-infected children to also be enrolled on study. Population: HIV-infected and uninfected children aged 0-12 years who could benefit from chemotherapy for LTBI to prevent the development of active tuberculosis, who have documented close recent exposure to a bacteriologically positive drug sensitive adult pulmonary TB source case, or who have proof of M. tuberculosis infection. HIV-infected children will be established on anti-retroviral therapy for at least 12 weeks prior to enrolment. Sites: TBTC Site 33, Desmond Tutu TB Centre, Department of Paediatrics and Child Health, Stellenbosch University, South Africa TBTC Site 34, Baragwaneth, Perinatal HIV Research Unit (PHRU), Wits Health Consortium, Soweto, Johannesburg, South Africa Study Duration: Child participants will be on study for a total of 24 weeks, including a 12-week rifapentine and isoniazid dosing period, with an additional follow-up period of 12 weeks. The overall study accrual period will be approximately 18 months and the total study duration will be approximately 36 months. Description of Agent or Intervention: Participants will receive 12 once-weekly doses of water-dispersible rifapentine and isoniazid; the initial rifapentine dose in each age cohort will be determined based on historical population models and will be adjusted as data become available in paediatric cohorts in this study. Cohorts 1 and 2 will open up with a pre-selected modeled dose. Dose selection for cohorts 3 and 4 will be modeled from data emerging from cohorts 1 and 2 and historical data. Doses in cohorts will be adjusted as required based on interim PK and safety analyses. Isoniazid will be given at doses of up to 25 mg/kg, once weekly, in combination with pyridoxine (Vitamin B6) 25 mg/kg.

6. Conditions and Keywords

Primary Disease or Condition Being Studied in the Trial, or the Focus of the Study
Latent Tuberculosis

7. Study Design

Primary Purpose
Prevention
Study Phase
Phase 1, Phase 2
Interventional Study Model
Single Group Assignment
Masking
None (Open Label)
Allocation
N/A
Enrollment
72 (Anticipated)

8. Arms, Groups, and Interventions

Arm Title
Single Arm Rifapentine and Isoniazid
Arm Type
Experimental
Arm Description
Single arm, open label and exposure-controlled. Intervention is rifapentine given in a new fixed dose combination once-weekly, in combination with isoniazid for 12 weeks, in HIV-infected and HIV-uninfected children aged 0-12 years in whom LTBI treatment is indicated. The protocol allows for parallel enrolment of children into cohorts 1 and 2, simultaneously, using a predetermined modeled initial dose for each cohort, separately. Similarly, cohorts 3 and 4 will be enrolled in parallel, using modeled doses for each cohort, based on data from cohorts 1 and 2 and historical data from TBTC trials.
Intervention Type
Drug
Intervention Name(s)
Rifapentine
Intervention Description
Rifapentine. Initial dose will be 25mg/kg. Based on interim analysis, this may be adjusted throughout the study to achieve target exposures. The standalone water-dispersible rifapentine tablet may be used to adjust the rifapentine doses, if needed.
Intervention Type
Drug
Intervention Name(s)
Isoniazid
Intervention Description
Isoniazid. 25mg/kg
Primary Outcome Measure Information:
Title
Rifapentine exposure among participants by median area under the curve (AUC)
Description
Target AUC is no more than 25% lower than, and no more than 75% higher than, the target AUC of 522 mcg*h/L. Data to be used for dose adjustments throughout the study and to create dosing algorithm for pediatric subgroups.
Time Frame
12 weeks
Secondary Outcome Measure Information:
Title
Number of participants with Grade 3 or 4 adverse events
Description
Cumulative number will be reported
Time Frame
24 weeks
Title
Proportion of participants with Grade 3 or 4 adverse events
Description
Cumulative proportion will be reported
Time Frame
24 weeks
Title
Number of participants who discontinue study drug due to an adverse event
Description
Cumulative number will be reported
Time Frame
12 weeks
Title
Proportion of participants who discontinue study drug due to an adverse event
Description
Cumulative proportion will be reported
Time Frame
12 weeks
Title
Estimation of rifapentine absorption rate constant (ka) from plasma drug levels
Description
Absorption rate constant will be estimated from plasma rifapentine blood levels, using population pharmacokinetic modeling methods. Models will be controlled for between-subject variability terms such as age and weight.
Time Frame
12 weeks
Title
Estimation of rifapentine volume of distribution (Vd) from plasma drug levels
Description
Volume of distribution will be estimated from plasma rifapentine blood levels, using population pharmacokinetic modeling methods. Models will be controlled for between-subject variability terms such as age and weight.
Time Frame
12 weeks
Title
Estimation of rifapentine oral clearance (Cl/F) from plasma drug levels
Description
Oral clearance will be estimated from plasma rifapentine blood levels, using population pharmacokinetic modeling methods. Models will be controlled for between-subject variability terms such as age and weight.
Time Frame
12 weeks
Title
Post-hoc Bayesian prediction of rifapentine and metabolite peak concentration (Cmax)
Description
Peak concentration will be predicted from plasma rifapentine and metabolite blood levels, using population pharmacokinetic modeling methods.
Time Frame
12 weeks
Title
Post-hoc Bayesian prediction of rifapentine and metabolite time to peak concentration (Tmax)
Description
Time to peak concentration will be predicted from plasma rifapentine and metabolite blood levels, using population pharmacokinetic modeling methods.
Time Frame
12 weeks
Title
Post-hoc Bayesian prediction of rifapentine and metabolite area-under-the-curve (AUC0-24)
Description
Area-under-the-curve will be predicted from plasma rifapentine and metabolite blood levels, using population pharmacokinetic modeling methods.
Time Frame
12 weeks
Title
Post-hoc Bayesian prediction of rifapentine and metabolite half life (t 1/2)
Description
Half life will be predicted from plasma rifapentine and metabolite blood levels, using population pharmacokinetic modeling methods.
Time Frame
12 weeks
Title
Palatability scores
Description
Using a standard validated Wong-Baker Faces tool which is a tool developed to help children communicate pain. For this outcome, the scale has been adapted to communicate like and dislike, and in-depth interviews
Time Frame
12 weeks
Title
Acceptability scores
Description
Using a standard validated Wong-Baker Faces tool which is a tool developed to help children communicate pain. For this outcome, the scale has been adapted to communicate like and dislike, and in-depth interviews
Time Frame
12 weeks
Title
Incidence of tuberculosis
Description
frequency of incident tuberculosis will be reported
Time Frame
24 weeks
Title
Estimation of isoniazid absorption rate constant (ka) from plasma drug levels
Description
Absorption rate constant will be estimated from plasma isoniazid blood levels, using population pharmacokinetic modeling methods. Models will be controlled for N-acetyltransferase 2 (NAT2) metabolizer genotype
Time Frame
12 weeks
Title
Estimation of isoniazid volume of distribution (Vd) from plasma drug levels
Description
Volume of distribution will be estimated from plasma isoniazid blood levels, using population pharmacokinetic modeling methods. Models will be controlled for N-acetyltransferase 2 (NAT2) metabolizer genotype
Time Frame
12 weeks
Title
Estimation of isoniazid oral clearance (Cl/F) from plasma drug levels
Description
Oral clearance will be estimated from plasma isoniazid blood levels, using population pharmacokinetic modeling methods. Models will be controlled for N-acetyltransferase 2 (NAT2) metabolizer genotype
Time Frame
12 weeks
Title
Post-hoc Bayesian prediction of isoniazid peak concentration (Cmax)
Description
Peak concentration will be predicted from plasma isoniazid blood levels, using population pharmacokinetic modeling methods, and accounting for N-acetyltransferase 2 (NAT2) metabolizer genotype
Time Frame
12 weeks
Title
Post-hoc Bayesian prediction of isoniazid time to peak concentration (Tmax)
Description
Time to peak concentration will be predicted from plasma isoniazid blood levels, using population pharmacokinetic modeling methods, and accounting for N-acetyltransferase 2 (NAT2) metabolizer genotype
Time Frame
12 weeks
Title
Post-hoc Bayesian prediction of isoniazid area-under-the-curve (AUC0-24)
Description
Area-under-the-curve will be predicted from plasma isoniazid blood levels, using population pharmacokinetic modeling methods, and accounting for N-acetyltransferase 2 (NAT2) metabolizer genotype
Time Frame
12 weeks
Title
Post-hoc Bayesian prediction of isoniazid half life (t 1/2)
Description
Half life will be predicted from plasma isoniazid blood levels, using population pharmacokinetic modeling methods, and accounting for N-acetyltransferase 2 (NAT2) metabolizer genotype
Time Frame
12 weeks

10. Eligibility

Sex
All
Minimum Age & Unit of Time
0 Years
Maximum Age & Unit of Time
12 Years
Accepts Healthy Volunteers
Accepts Healthy Volunteers
Eligibility Criteria
Inclusion Criteria: Aged 0 - 12 years Documented close (household or other close exposure) for at least an average 4 hours a day over the past 6 months to a bacteriologically confirmed adult (18 years or older) source case with pulmonary TB. The adult TB source case should have confirmed drug sensitive (sputum culture confirmed or XPERT MTB/Rif [Cepheid] positive TB and without any evidence of drug resistance, i.e., at least XPERT MTB/Rif rifampicin susceptible or an alternative molecular or phenotypic test indicating rifampicin susceptible M. tb) OR: Evidence of M. tb infection (positive TST ≥ 10 mm in HIV-uninfected and TST ≥ 5 mm in HIV-infected participants or a positive commercial interferon-gamma release assay, as defined by the manufacturer) Confirmed HIV status: HIV status will be confirmed by DNA PCR and Plasma HIV-RNA if the participant is <18 months of age. In participants ≥18 month of age HIV-ELISA testing will be completed. If any HIV test is positive in a child participant, regardless of age, the test result needs to be confirmed with a second HIV test, using HIV DNA or RNA PCR, from an independent sample. HIV-infected participants should be on an ART regimen for at least 12 weeks prior to enrolment and should be clinically stable before entering the study, regardless of CD 4 count and HIV viral load. While on study, participants must be on an efavirenz- or raltegravir-based ART regimen which should have been given for at least 14 days prior to enrolment. Caregiver (parent or legal guardian) gives written informed consent and assent from the child where applicable Weight > 2.5 kg but < 40 kg Exclusion Criteria: Active TB disease (evidenced by: symptoms suggestive of TB, or suggestive findings on clinical examination, or suggestive chest radiographic findings, or positive mycobacterial culture/molecular TB tests -if culture/molecular testing was clinically indicated and was completed-, or currently on TB treatment for active disease). Any documented drug resistant TB (DR TB) in an identified adult source case, defined as rifampicin resistance on Xpert or any other relevant approved molecular test, or phenotypic evidence of rifampicin resistance. Receipt of a once-daily isoniazid regimen for > 30 days which was given for at least 14 consecutive days in the 30 days prior to enrolment. Hb < 10 mg/dl Weight for age z score below 2 or severe clinical malnutrition Known allergy or hypersensitivity to isoniazid or rifapentine Documented hepatic disorder including > 5 fold elevated upper limit of normal (ULN) ALT and/or bilirubin Lansky play score < 50 Documentation of Hepatitis A or B infection Female adolescents who have reached menarche will not be eligible.
Central Contact Person:
First Name & Middle Initial & Last Name or Official Title & Degree
Rosanna Boyd, MPH
Phone
4045537434
Email
RBoyd1@cdc.gov
First Name & Middle Initial & Last Name or Official Title & Degree
Barbara DeCausey, MPH
Phone
404.639.5330
Email
dfv3@cdc.gov
Overall Study Officials:
First Name & Middle Initial & Last Name & Degree
Anneke Hesseling, MD
Organizational Affiliation
University of Stellenbosch
Official's Role
Principal Investigator
First Name & Middle Initial & Last Name & Degree
Mark Cotton, MD
Organizational Affiliation
University of Stellenbosch
Official's Role
Principal Investigator
First Name & Middle Initial & Last Name & Degree
Avy Violari, MD
Organizational Affiliation
PHRU
Official's Role
Principal Investigator
Facility Information:
Facility Name
Desmond Tutu TB Center, University of Stellenbosch
City
Stellenbosch
Country
South Africa
Individual Site Status
Recruiting
Facility Contact:
First Name & Middle Initial & Last Name & Degree
Anneke Hesseling, MD

12. IPD Sharing Statement

Learn more about this trial

Tuberculosis Clinical Trials Consortium Study 35

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