Using immunohistochemistry and antibodies specific for CD10, Bcl6, MUM1, GCET1, and FOXP1 as a surrogate for gene expression profiling, DLBCL was divided into 2 subtypes, germinal center (GC), non-GCB; a subset of cases are unclassified [1, 65]. Here, IRF4 is linked to diffuse large B-cell lymphoma.