The patient underwent a hysteroscopic examination and was diagnosed with endometrioid carcinoma grade 1 with squamous, local cord-like formations and hyalinization with positive expressions of estrogen receptor (ER) and progesterone receptor (PR) and negative expression of Calretinin in the area of endometrioid adenocarcinoma, as well as negative expressions of ER and PR and positive expression of Calretinin in the area of sex cord-like formations (Fig. 2). Here, ESR1 is linked to endometrioid adenocarcinoma.