NANOG and primary cutaneous T-cell non-Hodgkin lymphoma: The expression of embryonic stem cell genes such as Nanog homeobox (NANOG),SRY (sex determining region Y)-box (SOX)-2, andOCT4 (POU class 5 homeobox [POU5F]-1) and their upstream and downstream signaling members was shown in CTCL lesions2.