title: The occurrence of rheumatoid factor isotypes in early definite rheumatoid arthritis--no relationship with erosions or disease activity.
abstract: Seventy-one patients with definite rheumatoid arthritis and disease duration less than 2 years were followed prospectively. At study entry 43 patients had IgG rheumatoid factor (RF), 59, IgA-RF and 64, IgM-RF as measured with an ELISA; 48 were Waaler-Rose positive. After 2 years, joint erosions were present in 51 patients and absent in 19. One patient has not been followed long enough. The calculated relative risks contributed by different RF to the presence of erosions were low. No significant correlations between markers of disease activity and RF levels initially were found. The clinical value of RF isotype determination seems limited.
authors.affiliation: Department of Rheumatology, University Hospital, Lund, Sweden.
authors.forename: K B
authors.initials: KB
authors.lastname: Eberhardt
authors.forename: B
authors.initials: B
authors.lastname: Svensson
authors.forename: L
authors.initials: L
authors.lastname: Truedsson
authors.forename: F A
authors.initials: FA
authors.lastname: Wollheim
mesh_terms: D000368:Aged; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000627:therapeutic use; D001172:Arthritis, Rheumatoid / Q000097:blood* / Q000000981:diagnostic imaging / Q000503:physiopathology; D001175:Arthrography; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D006801:Humans; D007132:Immunoglobulin Isotypes / Q000032:analysis*; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D012217:Rheumatoid Factor / Q000032:analysis*; D012720:Severity of Illness Index
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D007132:Immunoglobulin Isotypes; D012217:Rheumatoid Factor