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Are polymyalgia rheumatica and giant cell arteritis the same disease?
Fabrizio Cantini1, Laura Niccoli, Lara Storri
12nd Divisione de Medicina, Unità Reumatologica, Ospedale di Prato, Prato, Italy. fcantini@conmet.it
Seminars in Arthritis and Rheumatism
|April 14, 2004
Summary
Polymyalgia rheumatica (PMR) and giant cell arteritis (GCA) often occur together in patients over 50. While related, the exact nature of the polymyalgia rheumatica and giant cell arteritis association remains unclear.
Area of Science:
- Rheumatology
- Immunology
- Epidemiology
Background:
- Polymyalgia rheumatica (PMR) and giant cell arteritis (GCA) are inflammatory conditions primarily affecting individuals over 50.
- These conditions frequently coexist in the same patient, suggesting a potential link.
Purpose of the Study:
- To review and summarize existing evidence on the relationship between PMR and GCA.
- To explore potential shared etiologies and differentiating factors between these two rheumatologic diseases.
Main Methods:
- A comprehensive review of English-language literature was conducted.
- Relevant articles focusing on the association between PMR and GCA were analyzed.
Main Results:
- Epidemiological data indicate a strong association, with PMR symptoms present in 40-60% of GCA cases and positive GCA findings in some isolated PMR patients.
- Genetic studies show conflicting results for HLA-DRB1 but suggest different expression of RANTES, TNFalpha, and IL-6 polymorphisms.
- Cytokine analysis indicates interferon-gamma production in GCA but not PMR, potentially playing a role in vasculitis development. Infectious agent searches yielded no definitive common cause.
Conclusions:
- PMR and GCA are closely associated conditions, frequently presenting concurrently.
- Despite the observed overlap, the precise nature of the relationship between PMR and GCA is not definitively established.