NFKB1 and diffuse large B-cell lymphoma: Gene expression profiling studies have contributed to the definition of different DLBCL subgroups, including germinal center B-cell like DLBCL (GCB subgroup) and activated B-cell like DLBCL (ABC subgroup) that are characterized by constitutive activation of the nuclear factor kappa-light-chain-enhancer of activated B cells (NFKB) pathway (3).