AGBL2 and rheumatoid arthritis: For the different ELISA tests investigated in this study, the area under the ROC curves (RA vs. healthy blood donors) was not significantly different: CFFCP1, 0.926 (95% CI, 0.905-0.947); CFFCP2, 0.953 (95% CI, 0.938-0.969); CFFCP3, 0.925 (95% CI, 0.903-0.947), and CCP2, 0.940 (95% CI, 0.921-0.959).