Phase 3
Completed N=1,002
Study 33: Adherence to Latent Tuberculosis Infection Treatment 3HP SAT Versus 3HP DOT
Source: ClinicalTrials.gov NCT01582711 ↗Enrolled (actual)
1,002
Serious AEs
2.2%
Results posted
Mar 2025
Primary outcomePrimary: Treatment Completion Rate. — 294; 248; 250 Participants
◆ Published Evidence
Highly cited
175citations · ~19 / year
Self-administered Versus Directly Observed Once-Weekly Isoniazid and Rifapentine Treatment of Latent Tuberculosis Infection: A Randomized Trial.
Summary
The study is an open label, multicenter, randomized (three arms: DOT (standard control), SAT, SAT with SMS reminders) controlled clinical trial. The trial is conducted in patients diagnosed with latent tuberculosis infection (LTBI) who are recommended for treatment. The primary objective is to evaluate adherence to a three-month (12-dose) regimen of weekly rifapentine and isoniazid (3RPT/INH) given by directly observed therapy (DOT) compared to self-administered therapy (SAT). The secondary objectives:
* To compare the treatment completion rates between participants randomized to SAT without reminders versus SAT with weekly SMS reminders
* To evaluate the timing of doses and patterns of adherence to once weekly RPT/INH among participants who complete treatment and those who discontinue therapy prior to completion.
* To determine the availability and acceptability of using SMS reminders among all patients consenting to participate in the study.
* To determine the toxicity and tolerability by comparing the rates of any drug-related grade 3 or 4 adverse events or death between the DOT arm and the SAT arms (both combined and individually)
* To compare the frequency, timing, and causes for failure to complete treatment between the DOT arm and the SAT arms
* To collect patient-specific cost data related to the 3 treatment arms
* To describe the pattern of antituberculosis drug resistance among Mycobacterium tuberculosis strains cultured from participants who develop active TB.
Linked Publications (3)
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Self-administered Versus Directly Observed Once-Weekly Isoniazid and Rifapentine Treatment of Latent Tuberculosis Infection: A Randomized Trial.
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Exposure to Latent Tuberculosis Treatment during Pregnancy. The PREVENT TB and the iAdhere Trials.
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Symptoms and Systemic Drug Reactions in Persons Receiving Weekly Rifapentine Plus Isoniazid (3HP) Treatment for Latent Tuberculosis Infection.
Outcome Measures
| Outcome | Result | p-value |
|---|---|---|
| PRIMARY Treatment Completion Rate. |
294; 248; 250 | — |
| SECONDARY Treatment Completion Rates Between Participants Randomized to SAT Without Reminders Versus SAT With Weekly SMS Reminders |
248; 250 | — |
| SECONDARY The Percentage of Participants Who Completed Treatment Based on SOC vs SOC Plus MEMS |
294; 271; 266; 294; 248; 249 | — |
| SECONDARY Availability and Acceptability |
34; 29; 28; 0; 229; 0 | — |
| SECONDARY Number and Percentage of Participants With Drug-related Grade 3 or 4 Adverse Events or Death |
23; 23; 29 | — |
| SECONDARY Number and Percentage of Participants Reason for Failure to Complete Treatment |
3; 7; 4; 12; 18; 14 | — |
| SECONDARY Patient-specific Cost |
361.50; 257.82 | — |
| SECONDARY Antituberculosis Drug Resistance |
0; 0; 1; 0; 0; 0 | — |
Eligibility Criteria
Inclusion Criteria
- Males and non-pregnant, non-nursing females
- Age > 18 years
- Weight > 45kg and considered appropriate to receive RPT 900mg and INH 900mg once weekly by the local site investigator
- Willingness to provide signed informed consent.
- Clinical indication for LTBI treatment such as: 1) persons with a positive tuberculin skin test (TST) as defined by CDC criteria or a positive interferon-gamma release assay (IGRA) defined per the manufacturers' guidelines AND one of the following: close contact to someone with culture confirmed TB, HIV infection, or > 2 cm2 of pulmonary parenchymal fibrosis on chest X-ray and no prior history of TB treatment; 2) TST or IGRA converters defined as a documented change from negative to positive within a two-year period; 3) Persons with any other clinical indication for LTBI treatment as locally defined including persons with a negative TST and/or IGRA (e.g. HIV-infected close contacts to an active pulmonary TB cases)
Exclusion Criteria
- Confirmed or suspected active TB
- Contacts to a source case with known resistance to isoniazid or rifampin
- Persons with a history (by written documentation or self-report) of ever receiving > 1 week of treatment for active or latent TB, regardless of whether the course was completed, because adherence may be different in people who previously took TB treatment
- Persons who are not considered candidates for SAT by the local investigator
- History of sensitivity or intolerance to isoniazid or rifamycins
- Serum alanine aminotransferase (ALT, SGPT) > 5x upper limit of normal among persons in whom an ALT is determined
- Persons with HIV-infection who 1) have a CD4 < 350 or 2) are currently receiving or planning to receive antiretroviral therapy in the first 120 days after study initiation (e.g., HIV-1 protease inhibitors, nucleoside or non-nucleoside reverse transcriptase inhibitors, CCR5 inhibitors or integrase inhibitors)
Data sourced from ClinicalTrials.gov (NCT01582711) and the linked publication. Outcome figures and adverse-event rates are extracted automatically from the registry's posted results and are provided for clinician reference, not as a substitute for the primary publication. Informational only — not medical advice.