DLK1 and adrenal gland neoplasm: Contrary to the findings within other adrenal tumors, OCT4, CD133, and NANOG expression was not detected in any of the samples from Oudjik et al., however expression of other stem cell markers such as DLK1/PREF1, NGFR, LIN28, SOX2, and THY1 was observed in 12-40% of cases, whereas the expression of Nestin, SOX17 and CD117 was identified less frequently in 2–3% of cases (65).