Preliminary Study of CXCL3 As a Biomarker of Diabetic Kidney Disease

The goal of this study is to learn about CXCL3 as a biomarker for type 2 diabetic kidney disease (DKD) in adults between age of 18-80. The main question it aims to answer is: * Is CXCL3 elevated in the serum or urine of type 2 adult DKD patients compared to normal control or diabetes mellitus without kidney involvement? * Is CXCL3 elevated in the mRNA of PBMC of type 2 adult DKD patients compared to normal control or diabetes mellitus without kidney involvement? * Is CXCL3 elevated in the kidney tissue of type 2 adult DKD patients compared to normal control or other glomerulonephritis? Participants have already been diagnosed as DKD by renal biopsy.