Histopathologic features and phenotypic variations of LBCLLT. (A) Large round cells predominate; (B) strong positivity for Bcl-2; (C) positive staining for Bcl-6; (D) strong, uniform expression of FOX-P1; (E) strong, uniform positivity for MUM-1; (F) staining for MUM-1 showing only a weak expression of the protein.