BCL2 and mantle cell lymphoma: The expression of antiapoptotic protein Bcl-xl did not alter significantly after treatment; no apparent change of the protein level of Bcl-2 was found in the BTZ group and ATO group compared with the control cells in two MCL cell lines, whereas in the combination group, the level of Bcl-2 decreased in the Jeko-1 cells and not changed in the Granta-519 cells.