In the 4% of cases associated with transformation into moderately differentiated G2 endometrioid carcinoma, the mean rate of Ki67 + cells was 29.64%/× 200, and in the 12% of cases associated with atypical hyperplasia, the mean rate of Ki67 + cells ranged from 17.09%/× 200 to 13.36%/× 200 (average values were performed for each case, and then the overall average value was obtained). This evidence concerns the gene MKI67 and endometrioid adenocarcinoma.