Expression of TNF-α, pAKT, BAFF, BCL3, BCL10, and NF-κB in gastric DLBCL (MALT) tumors. Aberrant expression of TNF-α (A), pAKT (B), and BAFF (C), and nuclear expression of BCL3 (D), BCL10 (E), and NF-κB (F) in the tumor cells of H pylori–independent gastric DLBCL (MALT) lymphoma patients. Double immunohistochemical staining showed that (G) tumor cells with BAFF nuclear staining (brown) are also CD20⁺ (red). (H) Tumor cells expressing pAKT staining (brown) are also CD20⁺ (red).