POU5F1 and neoplasm: CXCR4+ subsets had enhanced self-renewal (The CXCR4-positive subgroup exhibited a 45% increase in the ability to form tumor spheres), spindle morphology and migration/invasion with upregulation of markers of EMT, Snail, Twist, Vimentin, N-cadherin, stemness, Oct4, Nanog, Sox2 and downregulation of E-cadherin.