Prognostic Value of Peritoneal Washing Cytology in Gynecologic Malignancies: a Controversial Issue

Purpose: To evaluate the prognostic impact of peritoneal washing cytology in patients with endometrial and ovarian cancers. Materials and Methods: We retrospectively identified 86 individuals with ovarian carcinomas, ovarian borderline tumors and endometrial adenocarcinomas. The patients had been treated at Shahid Sadoughi Hospital and Ramazanzadeh Radiotherapy Center, Yazd, Iran between 2004 and 2012. Survival differences were determined by Kaplan-Meier analysis. Multivariate analysis was performed using the Cox regression method. A p<0.05 value was considered statistically significant. Results: There were 36 patients with ovarian carcinomas, 4 with borderline ovarian tumors and 46 with endometrial carcinomas. The mean age of the patients was $53.8{\pm}15.2years$. In patients with ovarian carcinoma the overall survival in the negative cytology group was better than the patients with positive cytology although this difference failed to reach statistical significance (p=0.30). At 0 to 50 months the overall survival was better in patients with endometrial adenocarcinoma and negative cytology than the patients with positive cytology but then it decreased (p=0.85). At 15 to 60 months patients with FIGO 2009 stage IA-II endometrial andocarcinoma and negative peritoneal cytology had a superior survival rate compared to 1988 IIIA and positive cytology only, although this difference failed to reach statistical significance(p=0.94). Multivariate analysis using Cox proportional hazards model showed that stage and peritoneal cytology were predictors of death. Conclusions: Our results show good correlation of peritoneal cytology with prognosis in patients with ovarian carcinoma. In endometrial carcinoma it had prognostic importance. Additional research is warranted.