Genetic Determinants of Ankylosing Spondylitis Severity - Longitudinal Study

Genetic Determinants of Ankylosing Spondylitis Severity - Longitudinal Study

This study is completed.
Verified by National Institutes of Health Clinical Center (CC) June 28, 2018.

Sponsored by: National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS)
Information provided by: National Institutes of Health Clinical Center (CC) Identifier: NCT00056719


Man pointing at DNA interface on digital tablet This study will explore how genes may influence the severity of ankylosing spondylitis, a form of arthritis that affects the spine. Patients have inflammation of the joints of the spine, which may cause the bones of the spine to fuse, resulting in difficulty performing daily activities.

Patients who developed ankylosing spondylitis after age 16 may be eligible for this study. The onset of disease is dated to the first appearance of symptoms of inflammatory low back pain or restricted spinal motion. Patients with a spondyloarthropathy other than AS may not participate. Candidates will be screened with a medical history and physical examination, blood test, and review of their medical records. They will also complete a questionnaire about their disease symptoms and medical history.

Those enrolled in the study will return to the NIH Clinical Center at 6, 12, 18, 24, 30, 36, 42, 48, 54, and 60 months after screening for examination of the joints, measurement of flexibility of the spine, and a blood test. They will also complete symptoms assessment and coping questionnaires. At the first study visit (screening visit), x-rays will be taken of the pelvis, lower back, and neck, if recent X-rays (within 1 year) are not available. These x-ray studies will be repeated on all patients every two years during the study (at 24 and 48 months after screening).

Ankylosing Spondylitis

MedlinePlus related topics:  Ankylosing Spondylitis
Genetics Home Reference related topics:  ankylosing spondylitis

Study Type: Observational
Study Design: Natural History

Official Title: Genetic Determinants of Ankylosing Spondylitis Severity - Longitudinal Study

Further study details as provided by National Institutes of Health Clinical Center (CC):

Study start: March 2003

The susceptibility to ankylosing spondylitis (AS) is largely genetically determined. Recent studies suggest that the severity of AS is also influenced by genetic factors. The goal of this study is to identify genes that influence the severity of AS. We hypothesize that genetic markers of susceptibility, including human leukocyte antigen (HLA) polymorphisms, and genes that regulate inflammation and bone formation, influence the severity of AS.

In this prospective longitudinal study, we will test the association of several genetic markers with the severity of AS. Approximately 700 patients will be included. Measures of AS severity will be patient-reported pain and stiffness, functional disability, patient and physician global assessments, joint counts, number of tender entheses, spinal mobility, and laboratory measures of inflammation. These measures will be assessed every 6 months for 5 years. We will also evaluate new laboratory tests as measures of the activity of AS.

Identifying genetic markers that are associated with differences in the severity of active inflammation in AS will enhance our understanding of the pathogenesis of this disease by suggesting mechanisms and pathways involved in the development of long-term damage. In a separate but related protocol, we will assess genetic markers associated with spinal fusion and long-term functional disability in patients with AS.

Ages Eligible for Study:  18 Years and above,  Genders Eligible for Study:  Both
Inclusion Criteria:

Participants will:

  1. have been diagnosed with AS by the modified New York criteria.
  2. be able to read English.

Exclusion Criteria:

Potential participants will be excluded if:

  1. onset of AS was at age 16 or younger.
  2. have a spondyloarthropathy other than AS.
  3. are unable to provide informed consent.
  4. anticipate not being available or able to comply with the schedule of study visits.

Study entry is not limited by sex or ethnic origin.

Children will necessarily be excluded.

Location and Contact Information
Please refer to this study by identifier  NCT00056719

Patient Recruitment and Public Liaison Office      (800) 411-1222

TTY      1-866-411-1010 

United States, California
      University of California @ San Francisco, San Francisco,  California,  94143,  United States; Recruiting
      Cedars Sinai Medical Center, Los Angeles,  California,  90048-1804,  United States; Recruiting
United States, Maryland
      National Institutes of Health Clinical Center, 9000 Rockville Pike, Bethesda,  Maryland,  20892,  United States; Recruiting
United States, Texas
      University of Texas - Houston Health Science Center, Houston,  Texas,  77030,  United States; Recruiting

More Information

NIH Clinical Center Detailed Web Page


Amor B, Santos RS, Nahal R, Listrat V, Dougados M. Predictive factors for the longterm outcome of spondyloarthropathies. J Rheumatol. 1994 Oct;21(10):1883-7.

Study ID Numbers:  030131; 03-AR-0131
Last Updated:  June 28, 2018
Record first received:  March 21, 2003 Identifier:  NCT00056719
Health Authority: United States: Federal Government processed this record on June 12, 2007
Updated on: 08/02/18