Uterine serous papillary carcinoma: histopathologic changes within the female genital tract.

The histopathologic features of 25 patients with uterine serous papillary carcinoma (USPC) were presented, with particular emphasis on the changes seen in the remaining müllerian epithelium. The mean age at presentation was 68.9 years; 52% of patients were stage III at the time of presentation and 40% died of their disease within 24 months of diagnosis. Histologic assessment revealed: 1) pure serous carcinoma in 56% of patients and mixed differentiation of serous and endometrioid in the remainder; 2) malignant epithelium reminiscent of that of USPC and akin to carcinoma in situ, frequently seen in the remaining endometrium, cervix, and, less commonly, the fallopian tube; 3) residual endometrium that, when identified (11/25 cases), was atrophic in all cases; 4) various types of cervical involvement in 17 cases (68%); 5) tumor within the fallopian tube in three cases (12%); and 6) carcinoma with in situ-like features in five cases (20%). In conclusion, it appears that USPC is frequently associated with malignant epithelial changes (as with carcinoma in situ) in the remaining müllerian epithelium. This finding suggests either a field change or, more likely, a transepithelial tumor spread. The latter theory is preferable, because this type of spread is frequently seen on serosal surfaces in cases of serous ovarian carcinoma. Uterine serous papillary carcinoma is, therefore, biologically more akin to its ovarian counterpart.