The purpose of the study is to find out if mosliciguat, the investigational drug that is being studied, with treprostinil, is safe and effective in treating adults who live with PH-ILD. Approximately 20 participants diagnosed with PH-ILD who are currently on a stable dose of inhaled treprostinil who meet all inclusion and no exclusion criteria will be enrolled. Part 1 of the study will take about 5 ½ months. Part 2 of the study is optional if you choose to participate in the extension period. Part 2 does not have a set end date and your participation in Part 2 will end if you or your study doctor decide to stop your participation or the Sponsor ends the study.

This is a Phase 3, open-label, follow-up study to evaluate the long-term safety,
tolerability, and efficacy of sotatercept when added to background PAH therapy for the treatment of PAH. Participants enrolled in this study are from the following parent studies: PULSAR, SPECTRA, STELLAR, HYPERION, and ZENITH. Participants eligible to enroll in this study will have participated in and completed the requirements of the MK-7962-004 study (Amendment 07 or later). In this study, participants will receive open-label sotatercept . The duration of participation for each participant will vary based on their enrollment date, but it is anticipated to be up to 3 years.

This study is the first time the drug PF-07868489 will be tested in humans. The goal is to see if the drug is safe and how the body reacts to it. In the first part, healthy adults will receive a single dose to check for any side effects and how the drug moves through the body. In the second part, patients with a specific lung condition called Pulmonary Arterial Hypertension (PAH) will receive multiple doses to see if the drug helps their condition and to further check its safety and effects.

This study is investigating the drug, called mosliciguat, for the treatment of PH-ILD. Participation in the study may last for about 4 ½ years, although the actual time of participation may be shorter or longer. Part 1 of the study will take about 6 months. Part 2 of the study could last up to about 4 years. During the study, participants will be required to make clinic visits in person and at times will need to meet with study staff over the phone/video. At some of the clinic visits, participants will have blood drawn and have procedures to test their lungs and heart function. Participants will be randomly assigned to get mosliciguat or placebo in Part 1. In Part 2, all participants will get mosliciguat. Approximately 120 people will participate in this study.

This Phase 3 study, comprising a double-blind, placebo-controlled treatment period of up to 48 weeks, will assess the efficacy and safety of seralutinib versus placebo when added to background PAH disease-specific medication in adult PAH subjects who are WHO FC II or III. The primary objective of the study is to assess the efficacy of seralutinib relative to placebo with a primary endpoint of change from baseline to Week 24 in 6MWD.

The PHAR is a multicenter, prospective registry of newly evaluated patients at PHCCs in the United States who have either PAH or CTEPH. Baseline information will be collected at the time of initial evaluation at the PHCC (within six months of the initial outpatient PHCC visit) with follow-up data collected at approximately 6-month intervals. This study will determine how patients with PH are evaluated, tested, and treated, and will observe how well patients do. The goal of the project is to see if patients with PH are treated according to recommended guidelines and to see if there are certain factors which lead to better or worse outcomes in patients with PH. There is no intervention or study medication used and there is no limitation to how a patient is treated in this study.