CD24 and ovarian cancer: Although some studies isolated ovarian cancer stem cells by selecting CD24− cells,33, 34, 56 most studies support CD24 as an important ovarian cancer stem cell marker.33, 34, 35, 57 We also demonstrated that the ovarian cancer stem-like cells possess EMT markers and significant chemoresistance in accordance with previous reports.34, 54, 58 These results confirmed that we had successfully enriched ovarian cancer stem-like cells from both cell lines.