Table 3

 Frequency of occurrence of different autoantibodies assessed at baseline and after 1 year of treatment with anti-tumour necrosis factor α agents according to clinical response

AutoantibodyResponders (83 patients)Non-responders (37 patients)
Baseline1 yearp ValueBaseline1 yearp Value
Anti-CCP, anti-cyclic citrullinated peptide antibodies; RF, rheumatoid factor.
RF (nephelometry)69610.18633321
IgM-RF65590.37231301
IgA-RF51410.15925261
IgG-RF48410.35026230.623
Anti-CCP60580.86432311