Interestingly, immunohistochemical analysis of the population of tumor stem cells, labeled by their expression of the CD15 antigen, showed that in MEN1611-treated group the proportion of apoptotic cells (measured as percentage ratio between CD15+Caspase3+ double-marked cells and total number of CD15+ cells) was 2.5-fold increased relative to control-treated tumors (p = 0.0019; Mann-Whitney U-test; Figures 8A, B). Here, FUT4 is linked to neoplasm.