CD80 and myeloid leukemia: Second, in myeloid leukemia cell lines, transient, low-dose decitabine exposure has been shown to induce CD80 gene expression in a variety of human leukemia cells, which provides evidence that epigenetic modulation can induce the expression of a major T cell co-stimulatory molecule on cancer cells, may overcome immune tolerance, and induce an efficient anti-tumor response [16].