The acute-phase response in relation to radiographic progression in early rheumatoid arthritis: a prospective study during the first three years of the disease.
Studies on the relationship between acute-phase protein (APP) production, clinical disease activity and progression of radiological damage in RA have been hampered by three factors: patients are studied at different stages of the disease; APP levels are taken incidentally rather than serially; and inter-individual differences in the relationship between the extent of the acute-phase reaction and the progression of radiological damage are not accounted for. A group of 110 newly diagnosed (complaints < 1 year) patients with RA were analysed for a follow-up period of at least three years. Damage was assessed radiologically according to the modified method of Sharp. As radiological progression is a cumulative event, APP production was also calculated by plotting serial CRP levels over time. Overall, a highly significant correlation was found between CRP production and radiological progression; however, a wide variation was observed due to inter-individual differences. The greatest variation was found in the lower range of CRP values, where inter-individual variation could not be accounted for by HLA-DR4, positive RF, sex or age. In conclusion, the prognostic use of serial measurement of APPs for the assessment of radiological progression is limited due to inter-individual variation. Knowledge of the factors underlying these inter-individual differences will increase the applicability of CRP in the prediction of joint damage for individual patients.
Department of Rheumatology, University Hospital, Groningen, The Netherlands.
M A
MA
van Leeuwen
M H
MH
van Rijswijk
D M
DM
van der Heijde
G J
GJ
Te Meerman
P L
PL
van Riel
P M
PM
Houtman
L B
LB
van De Putte
P C
PC
Limburg
D000210:Acute-Phase Reaction; D000293:Adolescent; D000305:Adrenal Cortex Hormones / Q000627:therapeutic use; D000328:Adult; D000368:Aged; D000893:Anti-Inflammatory Agents / Q000627:therapeutic use; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000627:therapeutic use; D001172:Arthritis, Rheumatoid / Q000000981:diagnostic imaging* / Q000188:drug therapy / Q000276:immunology*; D002097:C-Reactive Protein / Q000032:analysis; D005260:Female; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D011859:Radiography
D000305:Adrenal Cortex Hormones; D000893:Anti-Inflammatory Agents; D000894:Anti-Inflammatory Agents, Non-Steroidal; D002097:C-Reactive Protein