Serum cytokine levels in DLBCL patients. (A) Serum IL-10, IL-6, EGF, and IL-2 levels in DLBCL patients (n = 70) and healthy subjects (n = 24). (B-C) Serum-starved DHL2 cells were incubated with 100 ng/mL of human rIL-10, rIL-6, rIL-2, and rEGF for 30 minutes, and phosphorylation of JAK2 and STAT3 (B) and IkBα and ERK (C) were analyzed by Western blotting.