A Study to Test Whether Nerandomilast Helps People With Systemic Sclerosis

Nerandomilast is being developed to help people with systemic sclerosis by potentially improving symptoms and slowing disease progression. This study is open to adults who are at least 18 years old and have systemic sclerosis (SSc). People can join the study if they have limited or diffuse cutaneous SSc with disease onset within 7 years of the first non-Raynaud's symptom. The purpose of this study is to find out whether a medicine called nerandomilast helps people with systemic sclerosis. This study also aims to find out how well nerandomilast is tolerated in people with systemic sclerosis. Participants are put into 2 groups randomly, which means by chance. One group takes nerandomilast tablets and the other group takes placebo tablets. Placebo tablets look like nerandomilast tablets but do not contain any medicine. Participants take the tablets twice a day. Participants are in the study for 1 to about 4 years. During this time, they visit the study site regularly and get phone calls from the site staff. During study visits participants regularly have blood samples taken and doctors check changes in skin thickening, lung function, and internal organs, overall health and the safety and tolerability of study treatment in people with SSc. The results are compared between the groups to see whether the treatment works. The doctors also regularly check participants' health and take note of any unwanted effects.