In DLBCL patients, there was a significant correlation between serum miR21 and TGFB1 (R = 0.378, P = 0.006) and IL‐6 expression (R = 0.312, P = 0.024), between serum miR130b and IL‐6 expression (R = 0.323, P = 0.019), between serum miR155 and TGFB1 expression (R = 0.341, P = 0.013) and IL‐17D expression (R = 0.325, P = 0.019), and between serum miR28 and IL‐17D expression (R = −0.501, P < 0.001, Fig. 5F). The gene discussed is TGFB1; the disease is diffuse large B-cell lymphoma.