CEACAM1 and lymphoma: CEACAM1 was found to intensely stain the surface of the lymphoma cells from a majority of primary MCL biopsies (86.9%) and CLL/SLL (93.7%), and some cases of DLBCL (25.6%), follicular lymphoma (FL) (31.3%), and classical Hodgkin lymphoma (cHL) (7.7%) (Fig. 2f and Table 1).