ESR1 and neoplasm: Immunohistochemical analysis showed creatine kinase (CK) (+), estrogen receptor (ER) (+), GATA3 (−), Inhibin (−), Ki-67 (+), P16 (+), P53 (+, wild type), paired box 8 (Pax-8) (+), PMS2 (+), Progesterone receptor (PR) (++), SALL4 (−), synapsin (Syn) (+), Vimentin (focal +), and WT-1 (+), indicating an embryonic origin of the tumor (Figures 2C–P).