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Epetraborole

Phase 2

Mycobacterium Abscessus Infection | Small molecule | Infectious Disease |AN2 Therapeutics, Inc.|Last Updated: May 6, 2026

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Trial Design
RandomizedDouble-BlindPLACEBO_CONTROLLEDDMC
Total Trials1
Total Enrollment84
FDA Designations
No designations recorded
Clinical trial landscape

Epetraborole · 3 trials · 3 indications

Phase 2 1Phase 1 2
NCT07301320Epetraborole in Patients With Mycobacterium Abscessus Lung DiseaseMycobacterium Abscessus Infection
RECRUITING84 Analytics
PHASE2RECRUITING
Epetraborole in Patients With Mycobacterium Abscessus Lung Disease
Mycobacterium Abscessus InfectionUnlock trial analytics
Study Endpoints
Primary Endpoints
Clinical Response (NTM Symptom Evaluation Instrument) at Day 84
Day 1 to Day 84

Improvement in severity of at least 50% of the symptoms present at baseline and no deterioration in severity of symptoms present at baseline

Sputum culture conversion by Day 84
Day 1 to Day 84

Defined as 3 consecutive negative cultures one month apart without intervening or subsequent positives

Decrease in semi-quantitative sputum culture counts at Day 84
Day 1 to Day 84

Defined as improvement in sputum colony count category as defined by Griffith et al, 2015

Change from baseline in Quality of Life - Bronchiectasis (QOL-B) Respiratory Domain at Day 84
Day 1 to Day 84

QOL-B Domain scores range from 0 to 100, with higher scores indicating better health-related quality of life

Change from baseline in MACrO2 PRO at Day 84
Day 1 to Day 84

MACrO2 scores range from 0 to 100, with lower scores indicating better symptom-related quality of life

Sputum culture conversion by Day 56
Day 1 to Day 56

Defined as 2 consecutive negative cultures collected one month apart without intervening or subsequent positives

Characterize the PK Profile of Epetraborole and M3: Maximum Plasma Concentration
Cohorts 1-4: Day 1 to Day 4; Cohort 5: Day 1 - Day 8

Determination of the maximum observed plasma concentration (Cmax)

Characterize the PK Profile of Epetraborole and M3: Area Under the Plasma Concentration Versus Time Curve from Time 0 to the Last Time Point Evaluated
Cohorts 1-4: Day 1 to Day 4; Cohort 5: Day 1 - Day 8

Determine the area under the plasma concentration versus time curve from time 0 to the last time point evaluated (AUC0-t)

Characterize the PK Profile of Epetraborole and M3: Area Under the Plasma Concentration Versus Time Curve from Time 0 to 24 hours
Cohorts 1-4: Day 1 to Day 4; Cohort 5: Day 1 - Day 8

Determine the area under the plasma concentration versus time curve from time 0 to 24 hours (AUC0-24)

Characterize the PK Profile of Epetraborole and M3: Area Under the Plasma Concentration Versus Time Curve from Time 0 to Infinity
Cohorts 1-4: Day 1 to Day 4; Cohort 5: Day 1 - Day 8

Determine area under the drug concentration versus time curve, from time zero to infinity (AUC0-∞)

Characterize the PK Profile of Epetraborole and M3: Apparent total plasma clearance of drug
Cohorts 1-4: Day 1 to Day 4; Cohort 5: Day 1 - Day 8

Determine the apparent total plasma clearance of drug (CL/F)

Characterize the PK Profile of Epetraborole and M3: Time to Maximum Plasma Concentration
Cohorts 1-4: Day 1 to Day 4; Cohort 5: Day 1 - Day 8

Determination the time to maximum plasma concentration (Tmax)

Characterize the PK Profile of Epetraborole: Plasma from Hemodialysis Flow
Cohort 5: Day 5

Determine the AUC from 0 to the last quantifiable concentration AUClast immediately after the end of dialysis period from inflow (arterial) line

Characterize the PK Profile of Epetraborole:Plasma from Hemodialysis Flow
Cohort 5: Day 5

Determine the AUC from 0 to the last quantifiable concentration AUClast immediately after the end of dialysis period from inflow (venous) line

Characterize the PK Profile of Epetraborole and M3 in Urine: Cumulative drug excreted in urine over time
Cohorts 1-4: Day 1 to Day 4

Determine the cumulative amount excreted over all time intervals (0 to T), calculated as the sum of all amounts excreted from each interval (t1-t2)

Characterize the PK Profile of Epetraborole and M3 in Urine: Unchanged drug excreted in urine during the time interval
Cohorts 1-4: Day 1 to Day 4; Cohort 5: Day 1 - Day 8

Determine the fraction of unchanged drug excreted in urine during the time interval (expressed in %, calculated) for parent drug only

Characterize the PK Profile of Epetraborole and M3 in Urine: Renal Clearance
Cohorts 1-4: Day 1 to Day 4; Cohort 5: Day 1 - Day 8

Determine renal clearance (Ae(0-t)/ AUC0-T) for parent drug only

Characterize the PK Profile of Epetraborole and M3 in Dialysate: Concentration in full dialysate
Cohort 5: Day 5

Determine amount of drug measured in the whole dialysate volume during dialysis period

Characterize the PK Profile of Epetraborole and M3 in Urine: Dialysis clearance
Cohort 5: Day 5

Determine the Dialysis clearance over the dialysis period

Evaluate the Incidence of Treatment Emergent Adverse Events at Baseline and Through Study Completion
Cohorts 1-4: Day 1 to Day 4; Cohort 5: Day 1 - Day 8

Incidence, relatedness, and severity of adverse events

Evaluate Changes in Clinical Laboratory Tests from Baseline Through Study Completion
Cohorts 1-4: Day 1 to Day 4; Cohort 5: Day 1 - Day 8

Incidence of changes in clinical laboratory measurements from baseline

Evaluate Change in Vital Signs from Baseline Through Study Completion
Cohorts 1-4: Day 1 to Day 4; Cohort 5: Day 1 - Day 8

Incidence of changes in blood pressure, pulse, respiratory rate, and temperature

Evaluate Changes in 12-lead ECG Measurements from Baseline Through Study Completion
Cohorts 1-4: Day 1 to Day 4; Cohort 5: Day 1 - Day 8

Incidence of changes in 12-lead ECG parameters from baseline

Evaluate Physical Examination Abnormalities from Baseline Through Study Completion
Cohorts 1-4: Day 1 to Day 4; Cohort 5: Day 1 - Day 8

Incidence of physical exam abnormalities

Characterize the PK Profile of Epetraborole: Maximum Plasma Concentration
From Day 1 to follow-up visit through last follow-up visit (7 days after last dose)

Determination of the maximum plasma concentration (Cmax)

Characterize the PK Profile of Epetraborole: Minimum Steady State Plasma Concentration During a Dosage Interval
From Day 1 to follow-up visit through last follow-up visit (7 days after last dose)

Determination of the minimum steady state plasma drug concentration during a dosage interval (Cmin)

Characterize the PK Profile of Epetraborole: Time to Maximum Plasma Concentration
From Day 1 to follow-up visit through last follow-up visit (7 days after last dose)

Determination the time to maximum plasma concentration (Tmax)

Characterize the PK Profile of Epetraborole: Area Under the Plasma Concentration Versus Time Curve from Time 0 to the Last Time Point Evaluated
From Day 1 to follow-up visit through last follow-up visit (7 days after last dose)

Determine the area under the plasma concentration versus time curve from time 0 to the last time point evaluated (AUC0-t) with the plasma concentration at time "t" being the last measurable concentration

Characterize the PK Profile of Epetraborole: Area Under the Plasma Concentration Versus Time Curve from Time 0 to Infinity
From Day 1 to follow-up visit through last follow-up visit (7 days after last dose)

Determine area under the drug concentration versus time curve, from time zero to infinity (AUC0-inf)

Characterize the PK Profile of Epetraborole: Last Quantifiable Concentration
From Day 1 to follow-up visit through last follow-up visit (7 days after last dose)

Determine the actual time of last quantifiable concentration used in the determination of AUC0-last (Tlast)

Characterize the PK Profile of Epetraborole: Terminal Half-Life
From Day 1 to follow-up visit through last follow-up visit (7 days after last dose)

Determine the apparent terminal half-life (t½)

Characterize the PK Profile of Epetraborole: Terminal Elimination Rate Constant
From Day 1 to follow-up visit through last follow-up visit (7 days after last dose)

Determine apparent terminal elimination rate constant (Kel)

Secondary Endpoints
Patient Global Impression of Change (PGI-C) at Day 84
Day 1 to Day 84
Patient Global Impression of Severity (PGI-S) at Day 84
Day 1 to Day 84
Physician Visual Analog Scale (VAS) - Global at Day 84
Day 1 to Day 84
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Study Design & Arms
AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
High Dose EpetraboroleEXPERIMENTALThis arm is a daily treatment regimen of a 750mg oral dose of Epetraborole.
Low Dose EpetraboroleEXPERIMENTALThis arm is a daily treatment regimen of a 500mg oral dose of Epetraborole.
High Dose PlaceboPLACEBO_COMPARATORThis arm is a daily treatment regimen of a placebo, matching the high dose experimental arm.
Low Dose PlaceboPLACEBO_COMPARATORThis arm is a daily treatment regimen of a placebo, matching the low dose experimental arm.
Open LabelEXPERIMENTALAll subjects in Cohorts 1-4 receive 500 mg epetraborole once; Subjects on Cohort 5 receive 500 mg epetraborole twice
Epetraborole for Dose RangingEXPERIMENTALEpetraborole hydrochloride 250 mg, 500 mg, 750 mg, or 1000 mg PO q24h or 500 mg or 1000 mg PO q48h
Placebo for Dose RangingPLACEBO_COMPARATORMatching placebo for dose ranging
Epetraborole for Food EffectEXPERIMENTALFood effect cohort, single dose in fed and fasted conditions, dosage to be determined based on pharmacokinetics data obtained from previous cohorts
Placebo for Food EffectPLACEBO_COMPARATORFood effect cohort, single dose in fed and fasted conditions, dosage to be determined based on pharmacokinetics data obtained from previous cohorts
Interventions
NameTypeDescription
EpetraboroleDRUGHigh-dose intervention (750mg daily)
PlaceboDRUGPlacebo intervention (matching the high-dose experimental intervention)
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Eligibility Criteria
Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites1

Inclusion Criteria: 1. Male or female patients who are 18 years of age or older. 2. Willing and able to provide written informed consent. 3. Patients with MABc lung disease, meeting the following (a) Microbiological, (b) Clinical, (c) Radiographic a. Microbiological criteria: i. Documentation o...

Countries:United StatesAustralia
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Recent Changes (Last 90 Days)
MEDIUMMay 26, 2026NCT07301320Status: NOT_YET_RECRUITING → RECRUITING
LOWMay 24, 2026NCT07301320studyFirstPostDate: changed