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Isoniazid

Phase 2

Tuberculosis | Small molecule | Infectious Disease |GSK plc|Last Updated: May 19, 2026

Success Probability
Approval Probability 71%
TA Base Rate26%
Adjusted LOA41%
ML RiskLOW_RISK
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Market & Valuation
rNPV $3.2B
Market Size $9.4B
Revenue Basis $1.6B
Competitors 6
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Trial Design
RandomizedACTIVE_CONTROLLEDDMCBiomarker
Total Trials1
Total Enrollment900
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT07595042A Trial of Stratified Patient-Centered Treatment Regimens for Active TB (SPECTRA-TB)PHASE2 NOT YET_RECRUITING 900Jun 5, 2026Oct 22, 2029May 19, 202629 Argentina, Australia +14
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Study Endpoints
Primary Endpoints
Lower-risk group: Proportion of participants with sustained cure at 52 weeks after randomization
52 weeks after randomization

Sustained cure is defined as: participant known to be alive at or after 52 weeks after randomization; sustained culture negativity at 52 weeks after randomization, defined as the last 2 liquid cultures collected at different visits being Mtb-negative without an intervening Mtb-positive result, with the last collected no earlier than 48 weeks after randomization; no treatment failure or relapse through 52 weeks after randomization; and no retreatment or additional TB treatment beyond assigned study treatment through 52 weeks after randomization. Participants will be classified as having presence of sustained cure, absence of sustained cure, or not assessable.

Lower-risk group: Proportion of participants with at least 1 new Grade 3 to 5 adverse event through 28 weeks after randomization
Baseline through 28 weeks after randomization

Occurrence of at least 1 new Grade 3 to 5 adverse event during the 28 weeks following randomization among participants in the lower-risk group, where 28 weeks is 2 weeks beyond the longest scheduled treatment duration of 26 weeks.

Secondary Endpoints
Higher-risk group: Proportion of participants with sustained cure at 52 week after randomization
52 weeks after randomization
Higher-risk group: Proportion of participants with at least 1 new Grade 3 to 5 adverse event through 28 weeks after randomization
Baseline through 28 weeks after randomization
Proportion of participants with sustained cure at 72 weeks after randomization
72 weeks after randomization
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Study Design & Arms
AllocationRANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
Arm 1A: Higher-risk control groupACTIVE_COMPARATORParticipants at higher risk of unfavorable outcome will receive 26 weeks of standard-of-care treatment consisting of isoniazid, rifampin, pyrazinamide, and ethambutol for 8 weeks, followed by isoniazid and rifampin for 18 weeks.
Arm 1B: Higher-risk experimental groupEXPERIMENTALParticipants at higher risk of unfavorable outcome will receive 26 weeks of the HP1500ZM regimen consisting of rifapentine 1500 mg once daily, moxifloxacin 400 mg once daily, and isoniazid 300 mg once daily, with weight-based pyrazinamide during the first 8 weeks.
Arm 2A: Lower-risk control groupACTIVE_COMPARATORParticipants at lower risk of unfavorable outcome will receive 26 weeks of standard-of-care treatment consisting of isoniazid, rifampin, pyrazinamide, and ethambutol for 8 weeks, followed by isoniazid and rifampin for 18 weeks.
Arm 2B: Lower-risk experimental group (10 week duration)EXPERIMENTALParticipants at lower risk of unfavorable outcome will receive 10 weeks of the HP1500ZM regimen consisting of rifapentine 1500 mg once daily, moxifloxacin 400 mg once daily, and isoniazid 300 mg once daily, with weight-based pyrazinamide during the first 8 weeks.
Arm 2C: Lower-risk experimental group (12 week duration)EXPERIMENTALParticipants at lower risk of unfavorable outcome will receive 12 weeks of the HP1500ZM regimen consisting of rifapentine 1500 mg once daily, moxifloxacin 400 mg once daily, and isoniazid 300 mg once daily, with weight-based pyrazinamide during the first 8 weeks.
Arm 2D: Lower-risk experimental group (14 week duration)EXPERIMENTALParticipants at lower risk of unfavorable outcome will receive 14 weeks of the HP1500ZM regimen consisting of rifapentine 1500 mg once daily, moxifloxacin 400 mg once daily, and isoniazid 300 mg once daily, with weight-based pyrazinamide during the first 8 weeks.
Arm 2E: Lower-risk experimental group (16 week duration)EXPERIMENTALParticipants at lower risk of unfavorable outcome will receive 16 weeks of the HP1500ZM regimen consisting of rifapentine 1500 mg once daily, moxifloxacin 400 mg once daily, and isoniazid 300 mg once daily, with weight-based pyrazinamide during the first 8 weeks.
Arm 2F: Lower-risk experimental group (18 week duration)EXPERIMENTALParticipants at lower risk of unfavorable outcome will receive 18 weeks of the HP1500ZM regimen consisting of rifapentine 1500 mg once daily, moxifloxacin 400 mg once daily, and isoniazid 300 mg once daily, with weight-based pyrazinamide during the first 8 weeks.
Interventions
NameTypeDescription
IsoniazidDRUGAdministered orally once daily
RifampinDRUGAdministered orally once daily
PyrazinamideDRUGAdministered orally once daily
EthambutolDRUGAdministered orally once daily
RifapentineDRUGAdministered orally once daily
MoxifloxacinDRUGAdministered orally once daily
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Eligibility Criteria
Age Range13 Years — N/A
SexALL
Healthy VolunteersNo
Study Sites29

Inclusion Criteria: * Has pulmonary tuberculosis (TB) that is likely to respond to standard TB medicines (drug-susceptible TB), based on sputum testing done within 7 days before entering the study. The test must show Mycobacterium tuberculosis is present, with no rifamycin resistance detected and n...

Countries:ArgentinaAustraliaBotswanaBrazilHaitiIndiaKenyaMalawiMexicoPeruPhilippinesTanzaniaThailandUgandaVietnamZimbabwe
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Competitive Landscape -Tuberculosis 7 trials
Recent Changes (Last 90 Days)
LOWMay 24, 2026NCT07595042studyFirstPostDate: changed
LOWMay 21, 2026NCT07595042NEW_TRIAL: changed
LOWMay 21, 2026NCT07595042NEW_TRIAL: changed