Histopathologic features and phenotypic variations of FCLDT. (A) Large cleaved cells predominate; (B) variable, weak expression of FOX-P1; (C) strong, uniform expression of FOX-P1; (D) negativity for Bcl-2; please note internal positive controls; (E) strong positivity for Bcl-2; (F) positive staining for Bcl-6; (G) staining for MUM-1 showing only scattered positive cells; (H) strong positivity for MUM-1 in the great majority of neoplastic cells; (I) expression of CD10 by the large lymphocytes.