TGFB1 and systemic lupus erythematosus: In subgroup samples, haplotypes of the A2M gene within the SLE occurrence group (χ2 = 21.267, df = 11, Pglobal = 0.030) and haplotypes of FoxO1 (χ2 = 41.792, df = 11, Pglobal < 0.001) and TGF-β1 (χ2 = 34.531, df = 14, Pglobal = 0.001) genes within the CA occurrence group were significant in the global association.