NPC1 and nasopharyngeal carcinoma: However, there is limited evidence about the properties and functions of tanycytes in the human hypothalamus; as tanycytic processes can express different combinations of NPC markers, such as nestin/vimentin, nestin/GLAST or nestin/GFAP, or even each marker separately, tanycytes might represent molecularly and functionally heterogeneous subpopulations of NPC-like cells [16,387].