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OBJECTIVESEndometrial cancer is the most common malignant cancer of female reproductive organs. The number of diagnosed cases of endometrial cancer is increasing from year to year. Endometrial cancer is a neoplasm with a good survival rate. However, there are also cases with a fast, aggressive course. In recent years, the triple negative phenomenon (TNP) has been identified as one of the factors determining shorter survival in patients with endometrial cancer.MATERIAL AND METHODSThe study covered 265 patients with histopathologically confirmed endometrial cancer. Patients were divided into two groups: 1) patients with endometrial cancer with TNP; 2) patients with endometrial cancer without TNP. Tissue microarrays (TMA) were examined with immunohistochemistry to evaluate the expression of estrogen, progesterone and HER2 receptors. In several cases FISH method was used to assess HER2. The expression was evaluated by computer image analysis using the Nuclear Image Analysis virtual microscopy system. The evaluation of HER2 expression was performed manually. The criterion for TNC diagnosis was H-Score < 50 or < 75 and Allred score < 4.RESULTSDepending on the scoring system used, TNP was found in from 10.19% to 15.09% of cases. Regardless of the criteria employed in endometrial cancer, the presence of TNP was neither a factor increasing the risk of death nor it affected the patients' survival.CONCLUSIONSThe proportion of TNP diagnosed in endometrial cancer depends on the examined population and the diagnostic criteria. The incidence of TNP did not affect the survival of patients.

Triple negative phenomenon in endometrial cancer: recognition criteria and impact on survival