The salivary IGHG3 levels correlated with the erythrocyte sedimentation rate (<i>r</i> = 0.26, <i>p</i> = 0.01), anti-double-stranded DNA (dsDNA) antibody levels (<i>r</i> = 0.25, <i>p</i> = 0.01), and nephritis (<i>r</i> = 0.28, <i>p</i> = 0.01). This evidence concerns the gene IGHG3 and nephritis.