PTEN and serous adenocarcinoma: Of the 107 cases evaluated for PTEN expression, the highest prevalence of complete or partial PTEN loss was seen in EEC (36 cases, 64.3%), with 71.4% (10 cases) of high-grade EECs showing partial or complete loss of the protein compared to serous carcinoma that showed loss in 11 cases (37.9%; p = 0.05461).