PTEN and cancer: The expanding array of aberrant signaling pathways, including BMP, Hippo, Hedgehog, JAK/STAT, Wnt, Notch, PI3K/PTEN, and NF-κB, distinctly regulates the sustenance of cancer stem cells (CSCs) (Clara et al. 2020; Takebe et al. 2015; Yang et al. 2020).