REL and diffuse large B-cell lymphoma: Copy gain of BCL6, MDM2, and REL and copy loss of PTEN, FAS, and ING1 are particularly observed in GCB-DLBCL patients, while copy gain of SPIB and FOXP1 and loss of PRDM1 and CDKN2A are frequently observed in ABC-DLBCL patients [11].