544 Background: After surgery with curative intent for colorectal liver metastases (MHCCR), liver recurrence occurs in more than 60% of patients, despite the administration of adjuvant systemic chemotherapy. The objective of this study was to compare the prognosis of patients operated on MHCCR with high risk of recurrences in the liver, treated by postoperative chemotherapy hepatic arterial infusion (HAI) by oxaliplatin, to that obtained after adjuvant systemic chemotherapy. Methods: From January 2000 to December 2009, 113 patients who underwent curative resection of more than 3 MHCCR, were selected from a prospective database. Among these 113 patients, 47 had received postoperative HAI associated with systemic chemotherapy (HAI+) and 66, systemic chemotherapy alone (HAI-). Results: The two groups were comparable in age, sex, stage of primary, rates of synchronous (> 75%), and bilobar (> 90%) MHCCR. The number of MHCCR was significantly higher in the group HAI+ (p < 0.0001). Twenty-seven patients (57%) received more than 6 courses of HAI. HAI was discontinued in 6 patients (12%) due to technical problems with the catheter. After a median follow up of 75 months (7-125), the overall survival and recurrence-free survival at 5 years were higher for patients HAI+ compared to those HAI-, respectively 52.9% vs. 12.3% (p = 0.06) and 30.8% vs. 2% (p < 0.0001). Conclusions: The postoperative administration of oxaliplatin-based HAI associated to systemic chemotherapy after cure of MHCCR, improves recurrence-free survival of patients at high risk of hepatic recurrence, compared to systemic chemotherapy alone. No significant financial relationships to disclose.