AMACR and serous adenocarcinoma: Furthermore, we assessed several markers of endometrial carcinoma, including PTEN loss MMR deficiency, nuclear β-catenin expression (which are common in atypical hyperplasia and endometrioid carcinoma), p53-mutant-pattern (a marker of serous carcinoma), Napsin A, and AMACR positivity (confirmatory markers of clear cell carcinoma) [2], and none of them were found in EMRCs.