A proportional score of basaloid cells showing the expression of estrogen receptors reached 2.12 ± 0.80 in the adenoma group, 1.92 ± 0.67 in the epithelioma group and 1.20 ± 1.30 in the carcinoma group and the differences between the groups were not significant (p > 0.05). This evidence concerns the gene ESR1 and carcinoma.