POU5F1 and neoplasm: They represented less than 10% of the total tumor cells and expressed the mesenchymal stem cell markers CD44, CD90, CD146, CD73, and CD29 and the mesodermal marker vimentin (VIM), as well as the embryonic stem cell markers NANOG, OCT4, Musashi, and Nestin and embryonic renal marker Pax2, but lacked differentiative epithelial markers such as Cytokeratin.