In summary, mutations and amplifications of oncogenes K-ras and HER2/neu, mutations or deletions of tumor suppressor genes p53, p21, p16, and pTEN/MMAC1 as well as impaired DNA repair functions through mutations of hMLH1, hMSH2, and hMSH6 have been connected with the development of endometrial carcinomas [8]. Here, PTEN is linked to endometrial carcinoma.