The Program will allow access to brensocatib for patients who have completed the INS1007-301 ASPEN Clinical Trial. Patients will receive brensocatib 10 mg orally once daily. Eligible, compliant patients may receive brensocatib in this program until the drug is commercially available or until Insmed terminates the program.

The study will be an open-label, randomized, parallel arm study that will include a
treatment arm and control arm. Participants will have clinic visits at screening, randomization (day 1) and weeks 4, 12, 18, and 24. After week 24, participants will have clinic visits at weeks 32, 40, and 48. Participants will also have a telehealth visit on day 2 and phone calls to assess adverse events (AEs), serious adverse events (SAEs), and review patient education will occur during weeks 5, 8, 36, and 44. The phone calls may be converted to telehealth visits or clinic visits and / or followed by clinic visits, if the study team deems it necessary. Pulmonary function testing, quality of life survey (St. George's Respiratory Questionnaire (SGRQ)), and blood draw will occur at each clinic visit.

Following the study Entry Visit, subjects will return at Week 4,
Week 12, and every 12 weeks thereafter. Study visits will continue
for up to 6 years or until the subject prematurely discontinues study
treatment due to an adverse event or other reason, inhaled treprostinil
becomes commercially available for IPF in the region in which the
study is conducted, or the study is discontinued by the Sponsor
(whichever is sooner). Subjects will also be contacted by telephone or
email at least weekly until Week 12 and monthly thereafter in
between study visits to discuss study drug titration, assess study drug
tolerability, monitor adverse event, document changes to concomitant
medications, and remind subjects to bring in all study drug and a
device to their next clinic visit.