Safety and Efficacy of Continued CS1 Treatment of Patients With Pulmonary Arterial Hypertension

CS1-004 will be an extension of the CS1-003 Study. The primary objective of the CS1-004 study is to evaluate long-term safety and tolerability of continued treatment with CS1. The exploratory objectives are to evaluate clinical benefit by using Cardio-Microelectromechanical system (CardioMEMS), echocardiography, cardiac magnetic resonance imaging, right heart catheterization, quality of life assessments, and actigraphy to measure changes in clinical response with continued treatment with CS1 in patients with Pulmonary Arterial Hypertension (PAH).

Up to 30 patients are planned for enrollment in the ongoing phase 2 Study CS1-003; thus up to 30 patients could participate in Study CS1-004, if they completed the parent study, tolerated CS1 treatment, and in the investigator's judgement the benefits of continued treatment with CS1 outweigh the risk. Note that as the parent study is ongoing; thus, some patients will directly roll- over into Study CS1-004 with no disruption in CS1 treatment, while other patients that have already completed Study CS1-003, will need to be restarted on CS1. On a yearly basis, the principal investigator will determine if a patient continues the expanded access study for a subsequent year based on safety, tolerability, and clinical benefit of CS1. Continuation of the expanded access study will also be evaluated on a yearly basis by Cereno Scientific (Sponsor).