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Study of Ambrisentan in Subjects With Pulmonary Hypertension (ABS-LT)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00777920
Recruitment Status : Completed
First Posted : October 22, 2008
Last Update Posted : December 13, 2019
Information provided by (Responsible Party):
Gilead Sciences

Brief Summary:
This Phase 3, international, multicenter, open-label study will monitor the long-term safety of ambrisentan in adults with pulmonary hypertension. The available ambrisentan doses for this study are 5 or 10 mg administered orally once daily; the approved doses of ambrisentan in the United States, Canada, and the European Union are 5 and 10 mg. Investigators will be able to adjust ambrisentan dose as clinically indicated. A minimum of 4 weeks between dose adjustments is required. Participants receiving other therapies for pulmonary hypertension that are not contraindicated for concomitant use with ambrisentan are permitted to enroll in this study and continue to receive such therapies. Participants enrolled in this study will receive treatment with ambrisentan until such time as the investigator or participant chooses to stop ambrisentan treatment, ambrisentan becomes commercially available, or the Sponsor stops the study.

Condition or disease Intervention/treatment Phase
Pulmonary Hypertension Drug: Ambrisentan Phase 3

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 140 participants
Allocation: N/A
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: ABS-LT: A Phase 3, Long-Term, Open Label, Multicenter Safety Study of Ambrisentan in Subjects With Pulmonary Hypertension
Actual Study Start Date : November 17, 2008
Actual Primary Completion Date : September 11, 2019
Actual Study Completion Date : September 11, 2019

Resource links provided by the National Library of Medicine

Drug Information available for: Ambrisentan

Arm Intervention/treatment
Experimental: Ambrisentan
Participants will receive ambrisentan 5 mg or 10 mg once daily.
Drug: Ambrisentan
Ambrisentan tablet administered orally once daily
Other Name: Letairis

Primary Outcome Measures :
  1. Incidence and severity of adverse events (AEs) associated with long-term exposure to ambrisentan in participants with pulmonary hypertension [ Time Frame: Up to 9 years ]
    Incidence and severity of AEs will be summarized.

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

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Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Men and women with pulmonary hypertension (PH) who are discontinuing a clinical study of ambrisentan due to study closure by the Sponsor. Eligible subjects are those participating in countries where ambrisentan is not yet commercially available. Subjects participating in countries where ambrisentan is commercially available may be eligible if they do not qualify for treatment per the current prescribing information of that country.

Exclusion Criteria:

  • Subjects who have discontinued an ambrisentan clinical study for any other reason than Sponsor-initiated study closure are not eligible.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00777920

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Sponsors and Collaborators
Gilead Sciences
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Study Director: Gilead Study Director Gilead Sciences
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Responsible Party: Gilead Sciences Identifier: NCT00777920    
Other Study ID Numbers: GS-US-300-0124
First Posted: October 22, 2008    Key Record Dates
Last Update Posted: December 13, 2019
Last Verified: December 2019
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: No

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Studies a U.S. FDA-regulated Drug Product: Yes
Studies a U.S. FDA-regulated Device Product: No
Product Manufactured in and Exported from the U.S.: Yes
Additional relevant MeSH terms:
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Hypertension, Pulmonary
Vascular Diseases
Cardiovascular Diseases
Lung Diseases
Respiratory Tract Diseases
Antihypertensive Agents