Table 3.

RA-associated autoantibodies in “seronegative” RA

Antibody statusa	n	%
ACPA+/RF+/anti-CarP+	10	1.9
ACPA+/RF+/anti-CarP−	12	2.3
ACPA+/RF−/anti-CarP+	22	4.1
ACPA+/RF−/anti-CarP−	115	21.5
ACPA−/RF+/anti-CarP+	7	1.3
ACPA−/RF+/anti-CarP−	21	3.9
ACPA−/RF−/anti-CarP+	46	8.6
ACPA−/RF−/anti-CarP−	301	56.4

^aAntibody status was evaluated in 534 anti-CCP2 IgG−/IgM RF− EIRA patients. ACPA = any ACPA fine-specificity, RF = IgA and/or IgG RF, anti-CarP = anti-carbamylated fibrinogen antibodies