SOX2 and nasopharyngeal carcinoma: High ALDH1 activity, higher clone formation efficiency, differentiation capability and higher migration, enhanced capacities of growth, proliferation, and tumorigenesis,5 to 103 ALDH1high NPC cells required to induce tumors, vimentin+, and E-cadherin−,OCT4, SOX2 and Nanog+[27,28]