In serum and peripheral blood mononuclear cells (PBMCs) isolated from T2DM patients, the expression of PTPN2 correlated significantly but negative with UACR (β = −0.398, p < 0.001) and was significantly positive with VDR mRNA (β = 0.577, p = 0.022) and 25(OH)D3 (β = 0.185, p < 0.001) [70]. The gene discussed is VDR; the disease is type 2 diabetes mellitus.