SATB2 is Rarely Expressed in Endometrial or Endocervical Carcinoma

Special AT-rich sequence-binding protein 2 (SATB2) can distinguish primary ovarian mucinous tumors from ovarian metastases of colorectal or appendiceal tumors. However, its expression in other gynecological localizations remains underexplored. Whole-tumor sections of 376 endometrial and 27 endocervical carcinomas were examined for SATB2 expression. Among endometrial carcinomas, we found 10 cases (2.7%) expressing SATB2, all of which were endometrioid adenocarcinomas. In 8 of them, expression concerned only the morules. Only two cases expressed SATB2 in the glandular component, indicating 0.53% positivity in this cancer group. No stromal expression was detected. One case (3.8%) of endocervical adenocarcinoma focally expressed SATB2. SATB2 expression can be reliably used in the differential diagnosis of primary endometrial endometrioid and serous carcinomas as well as primary endocervical adenocarcinomas because nearly all of these tumors are SATB2-negative. SATB2 positivity in endometrial carcinomas is almost always restricted to morules within endometrioid adenocarcinomas.