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AP01

Phase 2

Progressive Pulmonary Fibrosis | Small molecule | Respiratory |Avalyn Pharma Inc.|Trials Updated: Oct 16, 2026

AP01 development status

Highest phase Phase 2
Registered trials 2 across 1 sponsor since Mar 2024

AP01 target and mechanism

ModalitySmall molecule

Also known as Pirfenidone Solution

Success Probability

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Market & Valuation

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Trial Design

UNCONTROLLED
Total Trials2
Total Enrollment738

FDA Designations

No designations recorded

AP01 clinical trials

AP01 · 2 trials · 11 indications

Phase 2 2
NCT06951217An Extension Study of Subjects Who Received an Avalyn Inhaled Antifibrotic Agent (SAIL)Progressive Pulmonary Fibrosis
RECRUITING340 Analytics
NCT06329401A Study Evaluating the Safety and Efficacy of Inhaled AP01 in Participants With Progressive Pulmonary FibrosisPulmonary Fibrosis
ACTIVE NOT_RECRUITING398 Analytics
PHASE2RECRUITING
An Extension Study of Subjects Who Received an Avalyn Inhaled Antifibrotic Agent (SAIL)
Progressive Pulmonary FibrosisUnlock trial analytics
PHASE2ACTIVE NOT_RECRUITING
A Study Evaluating the Safety and Efficacy of Inhaled AP01 in Participants With Progressive Pulmonary Fibrosis
Pulmonary FibrosisUnlock trial analytics

Study Endpoints

Primary Endpoints

To evaluate the long-term safety and tolerability outcomes of subjects receiving Avalyn nebulized antifibrotic medications (AP01).
Through end of study; average of 6 years

The incidence of adverse events will be evaluated from the time of signing of the informed consent until approximately 2 weeks after the last dose of study drug. Examples of potential adverse events include: respiratory symptoms, liver toxicity, and skin conditions. Study participants will be monitored for adverse events via the following: vital signs (blood pressure assessed using a sphygmomanometer, temperature assessed by thermometer, pulse and respiratory rate assessed by pulse oximeter), oxygen saturation, spirometry, physical exams, blood chemistry, and quality of life assessments.

To evaluate the effect of AP01 high dose twice a day (BID) or AP01 low dose twice a day (BID) compared to placebo twice a day (BID)
Week 52

Change from baseline in forced vital capacity (FVC) (mL)

Secondary Endpoints

To evaluate the long-term effect of Avalyn nebulized antifibrotic medications on lung function the change from baseline in forced vital capacity (FVC) will be evaluated.
Through end of study; average of 6 years
To evaluate the long-term effect of Avalyn nebulized antifibrotic medications on stabilization of disease.
Through end of study; average of 6 years
To evaluate the long-term impact of Avalyn nebulized antifibrotic medications on subject-reported quality of life (QoL).
Through end of study; average of 6 years
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Study Design & Arms

AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Open-label AP01 treatment armEXPERIMENTALAll trial participants will enroll from a Sponsor-led parent study of AP01 and receive open-label AP01 for continued evaluation of long-term safety and tolerability.
AP01 High Dose BIDEXPERIMENTALPirfenidone Solution for Inhalation
AP01 Low Dose BIDEXPERIMENTALPirfenidone Solution for Inhalation
Placebo BIDPLACEBO_COMPARATORPlacebo solution for inhalation

Interventions

NameTypeDescription
AP01COMBINATION_PRODUCTAP01 will be administered open-label via the eFlow Nebulizer System
PlaceboOTHERPlacebo oral inhalation solution
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites85

Inclusion Criteria: * Previously participated in an Avalyn-sponsored inhaled antifibrotic clinical study for subjects with either idiopathic pulmonary fibrosis (IPF) (IPF subjects are excluded from the US and Canada) or progressive pulmonary fibrosis (PPF) and with the approval of the Study Physici...

Countries:United StatesArgentinaAustraliaCanadaCzechiaFranceGermanyItalyNetherlandsNew ZealandPolandSpainUnited KingdomBelgiumTurkey (Türkiye)
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Recent Changes (Last 90 Days)

LOWOct 16, 2026NCT06329401Enrollment: 375 → 398
LOWOct 16, 2026NCT06329401Enrollment: 375 → 398
LOWOct 5, 2026NCT06329401lastUpdatePostDate: changed
LOWOct 5, 2026NCT06329401lastUpdatePostDate: changed
LOWOct 2, 2026NCT06951217lastUpdatePostDate: changed
LOWOct 2, 2026NCT06951217lastUpdatePostDate: changed
LOWAug 28, 2026NCT06951217lastUpdatePostDate: changed
LOWAug 28, 2026NCT06951217lastUpdatePostDate: changed
LOWAug 7, 2026NCT06951217lastUpdatePostDate: changed
LOWAug 7, 2026NCT06951217lastUpdatePostDate: changed

Frequently asked questions about AP01

What is AP01?

AP01 is an inhaled small molecule drug in development by Avalyn Pharma Inc. for progressive pulmonary fibrosis and pulmonary fibrosis. It is given by inhalation and is being studied in adults 18 years and older. AP01 is investigational and has not been approved for any indication.

What is AP01 used for in pulmonary fibrosis?

AP01 is being developed to treat progressive pulmonary fibrosis and pulmonary fibrosis, including forms secondary to systemic sclerosis and interstitial lung disease associated with connective tissue disease or rheumatoid arthritis. The clinical program enrolls adults with these fibrotic lung conditions. AP01 remains investigational and is not approved for use.

Who is developing AP01?

AP01 is being developed by Avalyn Pharma Inc., ticker AVLN. The company sponsors the Phase 2 clinical program for the inhaled small molecule in progressive pulmonary fibrosis and related fibrotic lung diseases. Avalyn Pharma is the sole developer named for this asset.

What phase is AP01 in?

AP01 is in Phase 2 clinical development. Both of its listed studies are Phase 2 trials in progressive pulmonary fibrosis and related interstitial lung diseases. AP01 is investigational and is not FDA approved; it remains in clinical testing for its proposed indications.

What clinical trials is AP01 in?

AP01 is being studied in two Phase 2 trials. NCT06329401 evaluates the safety and efficacy of inhaled AP01 in progressive pulmonary fibrosis and is active but not recruiting, with 398 participants. NCT06951217, the SAIL extension study, is recruiting 340 participants across the United States, Europe, and other countries.

Who is eligible for the AP01 extension study?

The SAIL extension study, NCT06951217, enrolls adults 18 years and older of all sexes who previously received an Avalyn inhaled antifibrotic agent. It is recruiting across the United States, Argentina, Australia, Canada, Czechia, France, Germany, Italy, Netherlands, New Zealand, Poland, Spain, and the United Kingdom, and does not enroll healthy volunteers.