A Study to Assess Whether Macitentan Delays Disease Progression in Children With Pulmonary Arterial Hypertension (PAH)


About this study

This is a prospective, multicenter, open-label, randomized, controlled, parallel group, group-sequential, event-driven Phase 3 study to evaluate efficacy, safety and pharmacokinetics (PK) of macitentan in children.

Participation eligibility

Participant eligibility includes age, gender, type and stage of disease, and previous treatments or health concerns. Guidelines differ from study to study, and identify who can or cannot participate. There is no guarantee that every individual who qualifies and wants to participate in a trial will be enrolled. Please contact the study team to discuss whether or not you are eligible to participate in a study.

Inclusion Criteria:

  1. Signed informed consent by the parent(s) or legally designated representative and assent from developmentally capable children prior to initiation of any study-mandated procedure.
  2. Males or females between ≥ 2 years and < 18 years of age.
  3. Subjects with body weight ≥ 10 kg at randomization.
  4. Pulmonary arterial hypertension (PAH) diagnosis, confirmed by historical right heart catheterization (mPAP ≥ 25 mmHg, and PAWP ≤ 15 mmHg, and PVRi > 3 WUxm2).
  5. PAH belonging to the Nice 2013 Updated Classification Group 1 (including subjects with Down syndrome) and of following etiologies:
    • idiopathic PAH
    • heritable PAH
    • PAH associated with congenital heart disease (CHD)
    • Drug or toxin induced PAH
    • PAH associated with HIV
    • PAH associated with connective tissue diseases (PAH-aCTD)
  6. WHO Functional class I to III.
  7. Females of childbearing potential must have a negative pregnancy test at Screening and at Baseline, and must agree to undertake monthly pregnancy tests, and to use a reliable method of contraception (if sexually active) up to the end of study (EOS).

Exclusion Criteria:

  1. Subjects with PAH due to portal hypertension, schistosomiasis, or with pulmonary veno-occlusive disease and/or pulmonary capillary hemangiomatosis, and persistent pulmonary hypertension of the newborn.
  2. Subjects with PAH associated with Eisenmenger syndrome, or with moderate to large left-to-right shunts.
  3. Subjects receiving a combination of > 2 PAH-specific treatments at randomization.
  4. Treatment with i.v. or s.c. prostanoids within 4 weeks before randomization, unless given for vasoreactivity testing.
  5. Hemoglobin or hematocrit <75% of the lower limit of normal range
  6. Serum AST and/or ALT > 3 times the upper limit of normal range'
  7. Pregnancy (including family planning) or breastfeeding.
  8. Any circumstances or conditions, which, in the opinion of the investigator, may affect full participation in the study or compliance with the protocol.

Participating Mayo Clinic locations

Study statuses change often. Please contact the study team for the most up-to-date information regarding possible participation.

Mayo Clinic Location Status Contact

Rochester, Minn.

Mayo Clinic principal investigator

Jonathan Johnson, M.D.

Open for enrollment

Contact information:

William Barnacle



More information


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Study Results Summary

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Supplemental Study Information

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