Studies have identified CD44+CD24− in breast cancer [44]; CD44+CD24+EpCAM+ in pancreatic or ovarian cancer [45,46]; and a high expression of neuron stem markers, such as CD133, CD44, and Nestin, and transcript factors, such as SOX2 and OCT4, in GBM. This evidence concerns the gene POU5F1 and glioblastoma.