Molecular expression characteristics confirm the malignancy concealed by morphological alterations in endometrial cancer after fertility-preserving treatment

Purpose Fertility-preserving treatment (FPT) has been widely used for young patients with early stage endometrial cancer (EC). However, the literature on the effectiveness and safety of FPT remains controversial. The aim of this study was to investigate malignant transformation in EC after FPT by immunohistochemistry (IHC).