ESR1 and neoplasm: The immunohistochemical examination of the tumor sample showed a positive result for the expression of Estrogen Receptor (ER), 100% (Allred’s scale: PS5+IS3=TS8), and Progesterone Receptor, (PGR) 100% (Allred’s scale: PS5+IS3=TS8), but negative results for HER2 receptor, 0%.