In agreement with this, previous histological studies have identified that extramammary Paget’s disease showed positive immunoreactivity against gross cystic disease fluid protein (GCDFP)-15, carcinoembryonic antigen (CEA), and cytokeratin (CK) 7, all of which receive the same response from the apocrine glands [8]. The gene discussed is CEACAM5; the disease is extramammary Paget disease.