We then quantitatively analysed macrophage content in liver and spleen tissue in T‐ALL mice by immunohistochemistry using an anti‐CD68 antibody, a marker of macrophages, as reported by Kong et al,24 The ratio of CD68+ macrophages in T‐ALL mice significantly increased when compared with mice receiving vehicle (Figure 1E,F). This evidence concerns the gene CD68 and acute lymphoblastic leukemia.