At the protein level, characteristic NPC markers were expressed by all NPC lines, and their phenotype was further validated by immunofluorescence of NESTIN, SOX2, and SOX1 at passage 3–4 after rosette selection, with no observable morphological differences between patient and CTRL cells (Fig. 2f, g and Supplementary Fig. 2b), indicating a successful generation of iPSC-derived NPCs. Here, SOX1 is linked to nasopharyngeal carcinoma.