Which condition is considered a positive indicator for HLA-B27 association?

Which condition is considered a positive indicator for HLA-B27 association?

• A. Ankylosing spondylitis
• B. Rheumatoid arthritis
• C. Osteoarthritis
• D. Systemic lupus erythematosus

Answer: (A)

HLA-B27 is a specific human leukocyte antigen that has a well-documented association with certain autoimmune conditions, particularly spondyloarthropathies. Ankylosing spondylitis is one of the primary conditions studied in relation to HLA-B27 positivity. Patients who are HLA-B27 positive have a significantly increased risk of developing ankylosing spondylitis, which is characterized by chronic inflammation of the spine and the sacroiliac joints. The presence of this antigen is not merely coincidental; rather, it plays a role in the pathogenesis of the disease, influencing the immune response to antigens in susceptible individuals. The other conditions listed have different immunological pathways and do not show the same level of association with HLA-B27. For instance, while rheumatoid arthritis and systemic lupus erythematosus are associated with various other HLA antigens, they typically do not involve HLA-B27. Osteoarthritis, being a degenerative joint disease rather than an autoimmune condition, is not associated with HLA-B27 at all. Thus, ankylosing spondylitis stands out as the condition most closely linked to HLA-B27, making it the positive indicator for this association.

HLA-B27 is a specific human leukocyte antigen that has a well-documented association with certain autoimmune conditions, particularly spondyloarthropathies. Ankylosing spondylitis is one of the primary conditions studied in relation to HLA-B27 positivity.

Patients who are HLA-B27 positive have a significantly increased risk of developing ankylosing spondylitis, which is characterized by chronic inflammation of the spine and the sacroiliac joints. The presence of this antigen is not merely coincidental; rather, it plays a role in the pathogenesis of the disease, influencing the immune response to antigens in susceptible individuals.

The other conditions listed have different immunological pathways and do not show the same level of association with HLA-B27. For instance, while rheumatoid arthritis and systemic lupus erythematosus are associated with various other HLA antigens, they typically do not involve HLA-B27. Osteoarthritis, being a degenerative joint disease rather than an autoimmune condition, is not associated with HLA-B27 at all.

Thus, ankylosing spondylitis stands out as the condition most closely linked to HLA-B27, making it the positive indicator for this association.