Cancer of the endometrium is the most common malignancy of the female reproductive system in developed countries, its incidence and associated mortality are increasing because rates of obesity have risen. [1][2][3] Two broad histologic types of endometrial cancer were proposed by Bokhman in 1983. 4 Type I tumors, affecting about 80% of cases, are mediated primarily by hyperestrogenism and are generally associated with a good prognosis. 2,5 Type II endometrial cancers, in contrast, have no exact pathogenesis. 2,5 Histologically, type II tumors are poorly differentiated or undifferentiated, most commonly serous and clear cell subtypes. 6 They are clinically aggressive, usually present at advanced stages, are associated with poor prognosis, and have a higher risk of recurrence. 6,7 Uterine serous carcinoma (USC) is the most common histologic type of type II endometrial cancer, accounting for about 80% of non-endometrioid endometrial cancer and approximately 40% of all endometrial cancer-related mortality. 8