The suppression of Mcl-1 inhibited the proliferation of a wide variety of human tumor cells, including prostate cancer [13], pancreatic cancer [14], small-cell lung cancer [15], ovarian cancer [16], chronic lymphocytic leukemia [17], hepatoma [18], leukemia [19], chronic lymphocytic leukemia [20], breast carcinoma [21], and melanoma [22], [23]. The gene discussed is MCL1; the disease is leukemia.