Key laboratory positive indicators: Immunoglobulin: IgG 18.84 g/L elevated, IgA 0.89 g/L decreased; IgG4 level: 7.72 g/L, significantly elevated; Thyroid function: TSH 5.480 μIU/mL elevated, thyroid antibodies negative; Other: Tumor markers, tuberculosis-related tests (PPD, T-SPOT.TB) were all negative. The gene discussed is CD79A; the disease is tuberculosis.