CST3 and chronic kidney disease: Total B cells (CD19+) were negatively correlated with SCr (r = −0.149, P = 0.004), cystatin C (r = −0.119, P = 0.032), BUN (r = −0.153, P = 0.003), and CKD (r = −0.241, P < 0.001), and were positively correlated with lymphocytes (r = 0.593, P < 0.001), T lymphocytes (r = 0.352, P < 0.001), NK cells (r = 0.144, P = 0.005), and the eGFR (r = 0.169, P = 0.001) (Table 2).