TGFB1 and diffuse large B-cell lymphoma: PBMCs from healthy donors were divided into six groups and co-cultured with the DLBCL cell lines OCI-LY10 (ABC subtype) and OCI-LY1 (GCB subtype), the human B lymphoblast cell lines WIL2S and DAKIKI at a 1:1 ratio, or in the presence of the cytokine TGF-β (3 ng/mL); the blank control group only included PBMCs.