The latest version of uterine tumors classification was done in 2003. According to WHO classification, endometrial cancers are divided into two groups, so called Type I and Type II. Endometrioid adenocarcinoma has a higher frequency and belongs to Type I. Serous and clear-cell adenocarcinoma, are forming Type II and by definition, they are high grade cancers with poor prognosis and no clearly defined precursors and predisposing risk factors. In Type I, there is a PTEN mutation and in Type II overexpression of p53. These two biomarkers are used in their differential diagnosis.WHO has defined a three-step system in determining the grade of endometrioid adenocarcinoma in which squamous component has no significance. There are other, two-step, grading systems which are not generally accepted.2009 FIGO classification is still in use for tumor staging and according to that tumors confined to the uterus body are divided into stages IA and IB. In the group of mesenchyme tumors, undifferentiated sarcoma was separated, due to different morphology and immunohistochemical profile compared to leiomyoma and endometrial stromal sarcoma. New terms, like UTROSCT, are accepted as well as new theory about the origin of carcinosarcoma. Common believe is that these tumors have epithelial origin and therefore sarcoma component showed positivity on epithelial and mesenchymal markers too. Large number of new antibodies was discovered which in the diagnosis and differential diagnosis of uterine tumors are only meaningful when used in correlation with the clinical picture and morphological data (endometrial carcinoma vs. ovarian carcinoma, adenosarcoma vs. adenofibroma).

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