Twenty-seven of 30 MCL as well as all CLL/SLL (29/29) stained strongly and diffusely for TCL1A (three MCL cases showed a weak or heterogeneous staining that was scored as negative), while 32/34 cases of FL (94 %) were positive for TCL1A. The gene discussed is TCL1A; the disease is B-cell chronic lymphocytic leukemia.