ESR1 and neoplasm: IHC revealed a positivity of the tumor cells for BerEp4, AE1/AE3, GATA‐3, Androgen Receptor (AR, 10%), CAM5.2, Estrogen Receptor (ER, 70%), Ki67 with a score of 10% and Progesterone Receptor (PR, 10%), negativity for TTF‐1, GCDFP‐15, HER‐2, HBME‐1, and Calretinin.