Pipeline

AN2 has a pipeline of novel boron-based compounds that have the potential to be best in class therapeutics. Our development pipeline spans hematologic diseases, infectious diseases, and oncology, alongside advanced research programs focused on targets in oncology, bone disorders and infectious diseases. The company intends to advance its global health initiatives using primarily non-dilutive funding, which the company obtains from sources such as public and private agencies and foundations. The Company is committed to delivering high-impact drugs to patients that address critical unmet needs and improve health outcomes.

development pipeline graphic

Epetraborole

Polycythemia Vera

We are expanding the development of oral epetraborole through a Phase 2 proof-of-concept clinical study in adults with phlebotomy-dependent polycythemia vera (PV). PV is a blood cancer characterized by overproduction of red blood cells in the bone marrow. This overproduction increases hematocrit, which can lead to serious medical complications including arterial and venous thromboembolic events. If untreated, PV can be life-threatening. Despite available therapies, many patients experience uncontrolled hematocrit levels and persistent symptom burden, requiring long-term management to maintain adequate disease control. PV is estimated to affect approximately 155,000 people in the U.S.

Mycobacterium abscessus complex lung disease 

The U.S. Food and Drug Administration has cleared an Investigational New Drug Application to proceed with a Phase 2 investigator-initiated study in collaboration with Oregon Health and Sciences University (OSHU) evaluating epetraborole for the treatment of Mycobacterium abscessus (M. abscessus) complex lung disease. This multicenter, randomized, double-blind, placebo-controlled, prospective clinical study will be led by Dr. Kevin Winthrop, Professor of Public Health and Infectious Diseases at OHSU, in conjunction with other investigators across an estimated 10-15 sites in the U.S. M. abscessus lung disease is a serious and difficult-to-treat non-tuberculous mycobacterial infection requiring prolonged therapy including IV-only antibiotics and characterized by limited treatment options and high rates of morbidity, and 5-year mortality. No FDA-approved drugs currently exist for its treatment.​​​​​​

AN2-502998

Chagas Disease

We are advancing oral AN2-502998 in a Phase 1 first-in-human trial as part of our Chagas disease development program. Chagas disease (American trypanosomiasis), is an infectious disease caused by Trypanosoma cruzi, which affects an estimated 6-10 million people worldwide, including approximately 300,000 people in the U.S. and over 100,000 in Europe. Chagas disease can remain asymptomatic for years before progressing to chronic disease. In approximately 20–30% of infected individuals, chronic infection leads to serious cardiac and gastrointestinal complications, including cardiomyopathy, heart failure, arrhythmias, stroke, and megacolon or megaesophagus, which can result in significant morbidity and premature death. AN2-502998 is the only compound of which we are aware to have demonstrated curative activity in preclinical studies across multiple species, including in nonhuman primates (NHPs) with long-term, naturally acquired chronic infections caused by diverse T. cruzi genetic types. Because NHP infections are naturally acquired in the environment, these efficacy data may be more predictive of efficacy in human clinical trials than other animal models. There are no FDA-approved treatments for adults with Chagas disease. A Phase 1 clinical study is underway evaluating the safety, tolerability, and pharmacokinetics of oral AN2-502998 in healthy volunteers.

Our Research and Development Initiatives 

We are pursuing a number of oncology targets where we believe our boron chemistry may offer a competitive advantage in terms of binding-site differentiation, pharmacodynamics, drug-like properties and intellectual property. Our lead oncology programs target PI3Kα and ENPP1. We plan to advance two oncology candidates into development targeting PI3Kα and ENPP1.

Beyond oncology, we are pursuing advanced research programs focused on targets in bone disorders and infectious diseases.

Global Health Programs 

Our global health strategy focuses on leveraging our proprietary boron chemistry platform to develop treatments for infectious diseases that disproportionately affect underserved populations. These programs are funded primarily through non-dilutive grant funding, including sources such as public and private agencies and foundations. Our global health programs include melioidosis, a severe bacterial infection associated with high death rates in endemic regions (funded by the U.S. government), and tuberculosis, a leading cause of death from infectious disease worldwide that affects millions of people each year in partnership with the Gates Foundation and GSK.

Clinical Trials

AN2 Therapeutics is committed to delivering high-impact drugs to patients that address critical unmet needs and improve health outcomes. Successful clinical trials are required to gain regulatory approval for new medications to advance patient care and may be required to support any approved products.

For information on AN2 Therapeutics clinical trials that may be recruiting, search AN2 Therapeutics at www.clinicaltrials.gov

Presentations and Publications

Epetraborole, a Potential Oral Agent for Mycobacterium abscessus Lung Disease
NTM Conference 2025

Qualitative Interviews to Develop the MACrO2 Patient-Reported Outcome Measure in Treatment-Refractory MAC Lung Disease (TR-MAC-LD)
NTM Conference 2025

Validation of the Quality of Life-Bronchiectasis (QOL-B) Respiratory Domain Patient- Reported Outcome (PRO) Measure in Treatment-Refractory MAC Lung Disease (TR-MAC-LD)
NTM Conference 2025

Validation of the MACrO2 Patient-Reported Outcome (PRO) Measure in Treatment-Refractory MAC Lung Disease (TR-MAC-LD)
NTM Conference 2025

Results: Phase 2 Study (EBO-301) to Assess the Efficacy, Safety, and PK of Oral Epetraborole (EBO) in Patients with Treatment-refractory Mycobacterium avium Complex Lung Disease (TR-MAC-LD)
NTM Conference 2025

Design: Phase 2/3, Randomized, Double-Blind, Placebo-Controlled, Multicenter, Prospective EBO-301 Study to Assess the Efficacy, Safety, and PK of Oral Epetraborole (EBO) Versus Placebo (PBO), Each in Combination with an Optimized Background Regimen (OBR), in Patients with Treatment-Refractory Mycobacterium avium Complex Lung Disease (TR-MAC-LD)
NTM Conference 2025

In vitro susceptibility of 147 international clinical Mycobacterium abscessus isolates to epetraborole and comparators by broth microdilution
Journal of Antimicrobial Chemotherapy 2024

In vitro activity and minimum inhibitory concentration (MIC) of Epetraborole against Burkholderia pseudomallei
10th Annual World Melioidosis Congress 2024

Efficacy of epetraborole against Mycobacteroides abscessus in a mouse model of lung infection
Antimicrobial Agents and Chemotherapy 2024

In Vitro Evaluation of Drug–Drug Interaction Potential of Epetraborole, a Novel Bacterial Leucyl-tRNA Synthetase Inhibitor Pharmaceuticals 2024

Epetraborole, a leucyl-tRNA synthetase inhibitor, demonstrates murine efficacy, enhancing the in vivo activity of ceftazidime against Burkholderia pseudomallei, the causative agent of melioidosis
PLOS 2023

Epetraborole In Vitro Activity Against Mycobacterium Avium Complex Recent Clinical Isolates from Japan (#2135)
ID Week 2023

A Phase 1, Multicenter, Open-Label, Parallel-Group Study to Assess the Safety and Pharmacokinetics of Oral Epetraborole Tablets in Adult Subjects with Varying Degrees of Renal Function (#2144)
ID Week 2023

A Phase 1, Open-Label, Single Dose Study to Evaluate the Pharmacokinetics (PK), Safety, and Tolerability of Epetraborole Tablets and the Impact of Alcohol Dehydrogenase Genotype on the PK of Epetraborole and Metabolite M3 in Healthy Japanese Adult Subjects (#2556)
ID Week 2023

Epetraborole: A Novel Antibiotic for NTM Lung Disease & Melioidosis
ID Week 2023

Epetraborole: A Novel, Oral Antibiotic for NTM Lung Disease
ID Week 2022

Pharmacokinetic-Pharmacodynamic Target Attainment Analyses to Support Epetraborole Dose Selection for the Treatment of Patients with Mycobacterium avium Complex Lung Disease
ID Week 2022

Population Pharmacokinetic Model Development for Epetraborole and MAC Lung Disease Patients Using Data from Phase 1 and 2 Studies
ID Week 2022

Dose-response Studies of the Novel Bacterial Leucyl-tRNA Synthetase Inhibitor, Epetraborole, in the Intracellular Hollow Fiber System Model of Mycobacterium avium complex Lung Disease
ID Week 2022

Pharmacokinetics/pharmacodynamics of Epetraborole, a Novel Bacterial Leucyl-tRNA Synthetase Inhibitor, and High Intracellular Penetration in the Intracellular Hollow Fiber System Model of Mycobacterium avium Complex Lung Disease
ID Week 2022

Epetraborole, a Novel Bacterial Leucyl-tRNA Synthetase Inhibitor, Demonstrates Potent Efficacy and Improves Efficacy of Standard of Care Regimen Against Mycobacterium avium complex in a Chronic Mouse Lung Infection Model
ID Week 2022

In Vitro Activity of Epetraborole, a Novel Bacterial Leucyl-tRNA Synthetase Inhibitor, in Drug Combinations Against Nontuberculous Mycobacteria Including Resistance Frequency and MIC Characterization of Mycobacterium avium ATCC 700898 Epetraborole-resistant Mutants
ID Week 2022

In Vitro Activities of Epetraborole, a Novel Bacterial Leucyl-tRNA Synthetase Inhibitor, Against Mycobacterium avium Complex Isolates
ID Week 2022

In Vitro Drug-Drug Interaction Evaluation of Epetraborole, a Novel Bacterial Leucyl-tRNA Synthetase Inhibitor
ID Week 2022

Tolerability and Pharmacokinetics of Oral Epetraborole at the Predicted Therapeutic Dosage for Mycobacterium avium Complex (MAC) Lung Disease: A Phase 1b Dose-ranging and Food Effect Study
ID Week 2022