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Table 3 Positive predictive value (PPV) of the anti-CCP antibody for erosive arthritis in each disease

From: Long-term follow-up of patients with anti-cyclic citrullinated peptide antibody-positive connective tissue disease: a retrospective observational study including information on the HLA-DRB1 allele and citrullination dependency

Disease name Without erosion
N = 36
With erosion
N = 29
PPV
%
SLE 17 (3) 6 (6) 26
Primary SS 6 (1) 0 (0) 0
SSc 2 (2) 13 (13) 87
PM/DM 7 (4) 0 (0) 0
MCTD/overlap syndrome 3 (1) 5 (5) 63
AOSD 0 (0) 1 (1) 100
SpA 1 (0) 1 (1) 50
Vasculitis 0 (0) 3 (3) 100
  1. Microscopic polyangiitis; n = 1, polyarteritis nodosa; n = 1, Takayasu arteritis; n = 1
  2. Number in parentheses stands for the number of RA-overlapped patients