IgA Antibodies in Early Rheumatoid Arthritis
Author Information
Author(s): Anna Svärd, Alf Kastbom, Åsa Reckner-Olsson, Thomas Skogh
Primary Institution: Rheumatology Clinic, Falu Hospital, Sweden
Hypothesis
Do IgA-class antibodies against cyclic citrullinated peptides provide additional diagnostic or prognostic information in early rheumatoid arthritis?
Conclusion
IgA anti-CCP antibodies are present in about one-third of early rheumatoid arthritis patients and are associated with a more severe disease course, but do not add diagnostic value beyond IgG anti-CCP analysis.
Supporting Evidence
- 29% of patients tested positive for IgA anti-CCP.
- IgA anti-CCP-positive patients had higher disease activity over time.
- The presence of IgA anti-CCP was significantly associated with smoking.
Takeaway
This study found that some people with early rheumatoid arthritis have a type of antibody that could mean their disease is worse, but it doesn't help doctors diagnose the disease better than another type of antibody.
Methodology
Serum samples were collected from 228 patients with recent-onset rheumatoid arthritis, and disease activity was measured over 3 years.
Potential Biases
The treating physicians were unaware of the patients' antibody statuses, which may reduce bias.
Limitations
The study did not include radiographic follow-up and relied on self-reported smoking status.
Participant Demographics
The study included 228 patients, with a mean age of 55 years, and a gender distribution of 158 women and 70 men.
Statistical Information
P-Value
p<0.001
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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