Both the small and large intestine of Mst1−/−Mst2fl/fl-villin-Cre mice exhibit an expansion of stem-like undifferentiated cells expressing high levels of CD133, Leucine-rich repeat-containing G-protein coupled receptor 5 (Lgr5) and Achaete-scute complex homolog 2 (Ascl2), which are stem cell markers in the intestine, an increased number of cells expressing CD44 and CD24, markers associated with colon cancer stem cells, and an almost complete absence of all secretory lineages. This evidence concerns the gene ASCL2 and malignant colon neoplasm.