Antibodies against native type ii collagen do not precede the clinical onset of rheumatoid arthritis

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Abstract
Serum levels of IgG and IgM antibodies to native human type II collagen were determined in 22 pre‐illness sera from subjects who developed seropositive rheumatoid arthritis (RA) 4 months to 5 years after sera were obtained, in 51 specimens from 35 healthy controls, and in 4–5 specimens from 58 patients with recent‐onset RA. The antibody levels in all pre‐illness serum specimens fell within the range seen for the healthy controls. Four RA patients had an IgG class antibody level and 4 had an IgM class antibody level that was above the highest level observed for controls, in at least 1 serum sample. No significant difference in the mean level of anticollagen antibodies was observed in the followup specimens from RA patients.