An Extension Study to QTI571A2301 to Evaluate the Long-Term Safety, Tolerability and Effectiveness of Imatinib in Severe Pulmonary Arterial Hypertension


  • Study type

  • Study phase

  • Study IDs

  • Describes the nature of a clinical study. Types include:

    • Observational study — observes people and measures outcomes without affecting results.
    • Interventional study (clinical trial) — studies new tests, treatments, drugs, surgical procedures or devices.
    • Medical records research — uses historical information collected from medical records of large groups of people to study how diseases progress and which treatments and surgeries work best.
  • During the early phases (phases 1 and 2), researchers assess safety, side effects, optimal dosages and risks/benefits. In the later phase (phase 3), researchers study whether the treatment works better than the current standard therapy. They also compare the safety of the new treatment with that of current treatments. Phase 3 trials include large numbers of people to make sure that the result is valid. There are also less common very early (phase 0) and later (phase 4) phases. Phase 0 trials are small trials that help researchers decide if a new agent should be tested in a phase 1 trial. Phase 4 trials look at long-term safety and effectiveness, after a new treatment has been approved and is on the market.

  • Site IRB
    • Rochester, Minnesota: 10-002780
    NCT ID: NCT01117987
    Sponsor Protocol Number: CQTI571A2301E1

About this study

The purpose of this extension study is to provide data on the long-term safety, tolerability, and efficacy of imatinib in the treatment of severe pulmonary arterial hypertension.

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. If you need assistance understanding the eligibility criteria, please contact the study team.

See eligibility criteria

This study has been terminated

Inclusion Criteria

  • Participated in CQTI571A2301 clinical trial and completed the week 24 visit of the study protocol, including all Study Completion assessments
  • Withdrew from the CQTI571A2301 study prematurely for reasons not related to study drug or not related to a safety issue but performed all Study Completion assessments

Exclusion Criteria

  • Had a pulmonary capillary wedge pressure > 15 mmHg at time of Study Completion assessments in core protocol CQTI571A2301
    • If pulmonary capillary wedge pressure is not attainable, then a left atrial pressure measurement may be used in its place
  • LVEF < 45%
  • Has thrombocytopenia, platelet count < 50E9/L (50E3/µL)
  • Has uncontrolled systemic arterial hypertension, systolic > 160 mmHg or diastolic > 90 mmHg
  • Has a QTcF > 450 ms for males and > 470 ms for females in the absence of right branch bundle block (based on Visit 1 ECG if required to be performed)

Other protocol-defined inclusion/exclusion criteria may apply

Participating Mayo Clinic locations

Study statuses change often. Please contact us for help.

Mayo Clinic Location Status

Rochester, Minn.

Mayo Clinic principal investigator

Robert Frantz, M.D.

Closed for enrollment


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