In immunohistochemical study, tumor cells express melanocytic markers (HMB-45, Melan-A) [1-3,5-7,10] and variably smooth muscle markers (smooth muscle actin, muscle-specific actin) [1-4,6,7] and hormone receptors (estrogen and progesterone receptors) [4,6]. The gene discussed is NR4A1; the disease is neoplasm.