Diagnostic utility of an anti-CCP point-of-care immunotest in Chinese patients with rheumatoid arthritis.
BACKGROUND
Early and accurate diagnosis of rheumatoid arthritis (RA) has become increasingly important. The clinical significance of anti-cyclic citrullinated peptide (CCP) antibody in Chinese RA adults was studied using an anti-CCP2 rapid test.


METHODS
Anti-CCP antibody and rheumatoid factor (RF) were determined in 95 RA patients and 140 patients with rheumatic diseases other than RA.


RESULTS
Two hundred and thirty five subjects were enrolled in this study. Both sensitivity and specificity of anti-CCP2 ELISA (78.9% & 95.7%) were higher than those of RF (67.4% & 84.3%). The area under the receiver operating characteristic curve for anti-CCP2 ELISA was 0.852 (95% CI: 0.792-0.913) which was larger than that for RF 0.775 (95% CI: 0.710-0.840). Both sensitivity and specificity (75.8% and 92.9%) of the anti-CCP2 rapid test were comparable to the ELISA. However, the sensitivity (62.1%) of a combined strategy by measuring anti-CCP antibody and RF was even lower than either marker alone although the specificity (98.6%) was slightly improved.


CONCLUSIONS
Anti-CCP antibody is a valuable tool for diagnosis of RA in Chinese patients. With the use of the reliable and user-friendly anti-CCP rapid test, it may have an important role in the design of therapeutic strategies in RA patients.
Department of Laboratory Medicine, First Municipal People's Hospital of Guangzhou, Affiliated of Guangzhou Medical College, Guangzhou, PR China.
Jun
J
Liao
Wai-sze
WS
Ip
Kwan-yee
KY
Cheung
Wai-man
WM
Wan
George W H
GW
Cautherley
Xiaoyan
X
Cai
Xiaojun
X
Lin
Reinhard
R
Renneberg
Cangel Pui-yee
CP
Chan
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000906:Antibodies / Q000097:blood* / Q000276:immunology*; D001172:Arthritis, Rheumatoid / Q000097:blood / Q000175:diagnosis*; D044466:Asian People; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010456:Peptides, Cyclic / Q000276:immunology*; D019095:Point-of-Care Systems; D012698:Serologic Tests / Q000379:methods*; D013997:Time Factors; D055815:Young Adult
D000906:Antibodies; D010456:Peptides, Cyclic; C487763:cyclic citrullinated peptide