文摘
Background Ovarian cancers have been recently categorized into types I and II according to a dualistic model of tumorigenesis. Data on the correlation between this classification and clinical outcome are still scarce and controversial. Methods A retrospective analysis of patients with ovarian cancer treated from 1998 to 2013 and operated by the same surgeon was conducted. Patients were classified into two groups: type I (125 patients), including low-grade serous, mucinous, endometrioid, and clear cell tumors; and type II (286 patients), including high-grade serous tumors, unspecified adenocarcinomas, and undifferentiated carcinomas. Results Type II patients had a significantly higher incidence of advanced disease than type I (88.4 vs. 65.6?%, P?=?0.0001) and required more aggressive surgical procedures. Rates of optimal tumor debulking were almost similar between groups (92.6 vs. 91.7?%, type I vs. II, P?=?NS). After a median follow-up of 41?months, 207 patients (50.4?%) were alive and 204 (49.6?%) were dead; 79 type I patients (63.8?%) and 237 type II patients (82.7?%) experienced relapse (P?=?0.02). Progression-free survival was significantly different between groups: 25?months for type I vs. 17?months for type II (P?=?0.023). Overall survival was not significantly different between groups, with a median overall survival of 75?months for type I vs. 62?months for type II (P?=?0.116). Conclusions The dualistic histotype-based classification into types I and II of ovarian cancer does not seem to correlate with prognosis. Different molecular characteristics of type I and II tumors may have therapeutic implications and should be deeply investigated.