Endometrial carcinoma is the most common malignancy of the female genital tract. Endometrioid type is the most common (80%) histotype of it. The prognosis of Endometrioid Endometrial carcinoma greatly depends on the histologic grade, stage of the disease and worsens after recurrence. However it’s difficult to predict the recurrence risk of it at the beginning of the disease. In our study we researched the relation between Microsatellit Instability and the prognostic factors of Endometrioid carcinoma in order to find out a new predictive marker; but could not find any association. So we considered MSI is not a good prognostic marker in Endometrioid Endometrial Carcinomas.