To further evaluate whether IL-24 induction by calcipotriol was linked to CD4+ T cell infiltration in mammary tumors, we assessed the colocalization of IL-24–expressing cells with CD4+ T cells in PyMt tumors of WT mice treated with EtOH, calcipotriol, or calcipotriol plus anti-CD4 Ab. This evidence concerns the gene CD4 and breast cancer.