Immune evasion phenotype is common in Richter transformation diffuse large B-cell lymphoma variant. - El Hussein S; Medeiros LJ; Gruschkus SK; Wei P; Schlette E; Fang H; Jelloul FZ; Wang W; Fiskus W; Kanagal-Shamanna R; Loghavi S; Yang H; et al. (Virchows Archiv : an international journal of pathology, 2023)