CD79A and rheumatoid arthritis: In the multivariate analysis, which included all markers associated with RA on univariate analysis, diagnosis of RA after 1 year of follow-up was associated with levels of anti-CCP (odds ratio [OR] 5.8 [3.4 to 10.0], P = 0.001) and beta2-microglobulin (OR 1.5 [1.0 to 2.0], P = 0.03) and tended, though not significantly, to be associated with IgA levels (OR 1.2 [0.9 to 1.5], P = 0.06).