CD79A and rheumatoid arthritis: IgA anti-CCP and IgA anti-CAP levels were correlated in HC (ρ = 0.41, p < 0.05), patients with PD (ρ = 0.39, p < 0.0001), patients with CF (ρ = 0.38, p < 0.05) and patients with RA (ρ = 0.21, p < 0.05).