Assessment on the diagnostic value of anti-carbamoylated antibodies in rheumatoid arthritis / 中华风湿病学杂志

ABSTRACT

Objective To evaluate the value of anti-carbamylated protein (CarP) antibody in the diagnosis of rheumatoid arthritis (RA).Methods The clinical data and serum of 247 in-patients with joint pain of Department of Rheumatology,General Hospital of Ningxia Medical University admitted during September 1,2015 to June 1,2016 were collected and divided into two groups according to the final diagnosisRA group (case group) which included 126 patients and the non-RA group which included 121 patients (control group).The concentration of anti-CarP antibody in serum was measured by enzyme linked immunosorbent assay (ELISA).The serum rheumatoid factor (RF) and anti-cyclic citrullinated peptide (CCP) antibodies were detected at the same time.Mann-Whitney U nonparametric test for statistical analysis,receiver operating characteristic curve (ROC) was drawn to determine the cut-off value of anti-CarP antibody to RA diagnosis and to analyze its diagnostic efficacy.Results The ROC curve showed that the anti-CarP antibody had a cutoff value of 63.77 U/ml,with the sensitivity of 74.60％,and specificity of 71.07％.Compared with RF and anti-CCP antibody,the area under the ROC curve (A) wereAanti-cyclic citrullinted peptide(anti-CCP)antibody (0.88)＞ARF (0.85)＞Anti-CarP antibody (0.78).There was no significant difference between the Aanti-CCP antibodies and ARF as well as ARF and Aanti-CarP antibodies (Z=1.29,P=0.20;Z=1.30,P=0.20),but there was significant difference between Aanti-CCP antibody and A anti Carp antibody (Z=2.28,P=0.02).Conclusion Anti-CarP antibody has certain value in the diagnosis of RA,and can be used as the serological index for RA diagnosis.