The purpose of the present study was to examine correlations between RF-IgA concentrations in sera of pSS patients and the levels of other autoantibodies (including RF IgM and IgG isotypes) with the results of dry eye tests, histopathological assessment of stages of inflammation in minor salivary gland lip biopsy (focus score, FS) and basic laboratory tests results. The gene discussed is CD79A; the disease is Keratoconjunctivitis sicca.