252 Background: The clinical implications of peritoneal lavage cytology (CY) status in the patients who received curative resection and adjuvant chemotherapy have not been established. The clinical implications of peritoneal lavage cytology (CY) status in the patients who received curative resection and adjuvant chemotherapy have not been established. Methods: We retrospectively analyzed clinical data from 143 consecutive patients who underwent macroscopically curative resection and received adjuvant gemcitabine or S-1 chemotherapy for pancreatic cancer from 2005 to 2014 in our institution. Correlations between CY status and survival and clinicopathological features were investigated. Results: Of the 143 patients, 21 patients were peritoneal washing cytology positive (CY+) (14.7%). Although significant difference was observed in the tumor size, no other correlation between cytology status and clinicopathological parameter existed (age, gender, histology, UICC T status, LN metastasis, lymphovascular invasion). The recurrence free survival (RFS) rates at 3 and 5 years after surgery were 5.1% and 0% in CY+ patients, respectively, and were 21.5% and 16.1% in peritoneal washing cytology negative (CY-) patients, respectively, which were significantly different (p<0.001). On the other hands, the OS rates at 3 and 5 years after surgery were 17.1% and 8.6% in CY+ patients, respectively, and were 26.1% and 16.1% in CY- patients, respectively, which were trend to worse in the CY+ patients. However, there was not significantly different (p=0.254). Conclusions: The patients with CY+ are likely to experience recurrence, even after they received curative resection and adjuvant Gemcitabine or S-1adjuvant chemotherapy. To improve the patient’s survival, it is necessary to develop efficient treatment for CY+ patients.
Retrospective Study of the Usefulness of Peritoneal Lavage Cytology in Patients with Curative Resection for Colorectal Cancer
