IL4 and diffuse large B-cell lymphoma: Compared to healthy controls, serum levels of IFN-γ (19.7 ± 10.5 pg/mL) and IL-4 (1.2 ± 1.4 pg/mL) in DLBCL patients were significantly lower at baseline (p = 0.000 and p = 0.001; Figure 7).