LSD1 has been found overexpressed in liver cancer [16], gastric cancer [17], breast cancer [18,19], bladder, lung and colorectal cancers [20], Ewing's sarcoma [21], and neuroblastoma [22]; and overexpression of LSD1 is a predictor of poor prognosis in prostate and liver cancer [16,23]. The gene discussed is KDM1A; the disease is gastric cancer.