Positive IHC staining of LSD1 was observed in 50% of normal ovarian epithelia, 72% of serous cystadenoma, 73% of mucinous cystadenoma, 82% of borderline serous and mucinous cystadenoma, 94% of serous cystadenocarcinoma, and 92% of mucinous cystadenocarcinoma, respectively (Table 1). The gene discussed is KDM1A; the disease is mucinous cystadenocarcinoma.