Genetic Risk Factors Associated With Antiphospholipid Antibody Syndrome

Recruiting now

Conditions studied: Antiphospholipid Syndrome

In brief

Antiphospholipid antibody syndrome (APS) is characterized by the presence of antiphospholipid antibodies, which are proteins in the blood that interfere with the body's ability to perform normal blood clotting. Clinical problems associated with antiphospholipid antibodies include an increased risk for the formation of blood clots in the lungs or deep veins of the legs, stroke, heart attack, and recurrent miscarriages. It is possible that some people with APS have a genetic predisposition for developing the syndrome. This study will use a genetic strategy to identify potential inherited risk factors for the development of APS by recruiting people with APS who have family members also affected by the syndrome or by another autoimmune disorder, such as lupus or rheumatoid arthritis.

Key facts

Study ID

NCT00482794

Run by

Duke University

People needed

2800

Starts

2006-06-01

Expected to finish

2029-03-01

Last updated by the study team

2026-05-29

Who can join

Age: any. Sex: any. Healthy volunteers: not accepted.

You may qualify if…

• Persistent presence of an antiphospholipid antibody, as defined by one or both of the following criteria:
• Medium or high anticardiolipin antibody level in the blood on two or more occasions at least 6 weeks apart
• Presence of lupus anticoagulant in the plasma on two or more occasions at least 6 weeks apart
• Presence of clinical symptoms seen in patients with APS, including vascular thrombosis (one or more clinical episodes of arterial, venous, or small vessel thrombosis in any tissue or organ) and/or pregnancy morbidity, defined as any of the following:
• One or more unexplained deaths of a morphologically normal fetus at or beyond the 10th week of gestation, with normal fetus morphology documented by ultrasound or direct examination or the fetus
• One or more premature births of a morphologically normal baby at or before the 34th week of gestation because of severe pre-eclampsia, eclampsia, or severe placental insufficiency
• Three or more unexplained consecutive spontaneous abortions before the 10th week of gestation, with maternal anatomic or hormonal abnormalities and paternal and maternal chromosomal causes excluded
• People who have elevated antiphospholipid antibody levels but do not fully meet clinical criteria for APS, and do have affected family members, will be considered for enrollment

You may not qualify if…

• No documented presence of antiphospholipid antibody

Where it is running

• Duke University Medical Center — Durham, North Carolina, United States (enrolling)

Full record on ClinicalTrials.gov

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