Clinical Trials

Inclusion Criteria:

• Male or female subjects must be ≥ 18 years of age. 
• Subjects must have a diagnosis of Systemic Sclerosis as defined by the 2013 American College of Rheumatology criteria/EULAR criteria.
• Subjects must have a diagnosis or history of Raynaud's Phenomenon, self-reported or reported by a physician, with at least a 2-phase color change in finger(s) of pallor, cyanosis, and/or reactive hyperemia in response to cold exposure or emotion.
• Subjects must have a minimum of 10 symptomatic Raynaud's Phenomenon attacks, documented in the electronic patient-reported outcomes (ePRO) diary, occurring over at least 3 separate days of the 3- to 5-day eligibility period.
• Subjects must complete a minimum of 80% of the daily ePRO diary entry during the baseline period.
• Female subjects of childbearing potential and male subjects must agree to use contraception for the duration of the study. 
• Subjects must be willing and able to comply with the study requirements and give informed consent for participation in the study.

Exclusion Criteria: 

• Female subjects who are pregnant or breastfeeding.
• Subjects with systolic blood pressure < 85 mmHg.
• Subjects with an estimated glomerular filtration rate <15 mL/min/1.73 m^2 at screening as determined by the Modification of Diet in Renal Disease equation.
• Subjects with an alanine aminotransferase and/or aspartate aminotransferase value > 3 × the upper limit of normal at screening.
• Subjects who have a digital ulcer infection within 30 days of screening.
• Subjects with a history of cervical or digital sympathectomy, or botulism toxin injections in their hands [for RP or digital ulcers] within 90 days of screening. Subjects should not have a planned botulism toxin or sympathectomy during their participation in the study.
• Subjects with gangrene or digital amputation within 6 months of screening.
• Subjects with current intractable diarrhea or vomiting.
• Subjects with a risk of clinically significant bleeding events, including those with coagulation or platelet disorders at screening.
• Subjects with a history of major trauma or hemorrhage within 30 days of screening.
• Subjects with clinically significant chronic intermittent bleeding, such as active gastric antral vascular ectasia or active peptic ulcer disease, within 60 days of screening.
• Subjects who have had any cerebrovascular events (e.g., transient ischemic attack or stroke) within 6 months of screening.
• Subjects with a history of myocardial infarction or unstable angina within 6 months of screening. Subjects should not have a planned coronary procedure during their participation in the study.
• Subjects with acute or chronic congestive heart failure (New York Heart Association Class III [moderate] or Class IV [severe]) at screening.
• Subjects with a history of more than mild restrictive or congestive cardiomyopathy uncontrolled by medication or implanted device.
• Subjects with a history of life-threatening cardiac arrhythmias.
• Subjects with a history of hemodynamically significant aortic or mitral valve disease.
• Subjects with a history of known pulmonary hypertension, pulmonary arterial hypertension, or pulmonary veno-occlusive disease.
• Subjects with a history of significant restrictive lung disease, defined as forced vital capacity < 45% predicted and diffusing capacity of the lungs for carbon monoxide <40% predicted (uncorrected for hemoglobin).
• Subjects with scleroderma renal crisis within 6 months of screening. 
• Subjects with a concomitant life-threatening disease with a life expectancy < 12 months.
• Subjects who have a clinically significant disorder that, in the opinion of the Investigator, could contraindicate the administration of study drug, affect compliance, interfere with study evaluations, or confound the interpretation of study results.
• Subjects who have taken or are currently taking any parenteral, inhaled, or oral prostacyclin or prostacyclin receptor agonists (e.g., epoprostenol, treprostinil, iloprost, and selexipag) within 8 weeks of screening.
• Subjects who have initiated or had a dose change of any of the following within 2 weeks of screening: oral, topical, or intravenous (IV) vasodilators (e.g., calcium channel blockers, phosphodiesterase-5 (PDE5) inhibitors [e.g., sildenafil, tadalafil, or vardenafil], nitrates, and
• fluoxetine).
• Subjects with any history of acetaminophen intolerability (e.g., allergic reaction to acetaminophen).
• Subjects with any malignancy that requires treatment during the study period, that has required treatment within 1 year of screening (including excision of skin cancer) or that is currently not in remission.
• Subjects who have used any investigational medication or device for any indication within 30 days or 5 half-lives (whichever is longer) of screening.
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