CD8A and B-cell chronic lymphocytic leukemia: In general, there are four mechanisms used by CLL cells to escape from the control of immune cells: (1) non-immunogenic tumor cell death; (2) expansion and recruitment of immunosuppressive cells, including T regulatory (T-reg) cells, M2 macrophages and myeloid-derived suppressor cells (MDSC); (3) depletion and/or inhibition of antitumor immune cells such as Th1 T-cells and CD8+ cells; and (4) production of immunosuppressive soluble factors such as IL-10 and TGF-β [4].