Retrospective determination of the correlation between the distance of tumor manifestation to peripancreatic arteries and overall survival in primary resected pancreatic ductal adenocarcinoma

e15745 Background: Current guidelines determine the resectability of PDAC by evaluating the contact of the tumor to peripancreatic vasculature. We wanted to evaluate the influence of this distance of the tumor to peripancreatic arteries on the overall survival of patients with primary resection of pancreatic ductal adenocarcinoma. Methods: Preoperative radiographs of 208 consecutive patients after distal pancreatectomy and/or pancreatoduodenectomy operated between 2007 and 2014 were included in the analysis. In reconstructions of CT and MRI data 90° planes to the centerline of the celiac trunc (CT), hepatic artery(HA) and superior mesenteric artery(SMA) were computed with Aquarius Intuition Viewer (V4.4.11, Terarecon). The closest distance between the tumor and the CT /HA and SMA was determined by an experienced pancreatic surgeon and radiologist independently and upon a deviation greater than 3 mm consent was reached by additional review in 33,2% (69/208) of the cases. Results: 176 CT and 32 MRI scans of 208 patients were evaluated. 2.4 % (5/208) of the radiographs were excluded due to insufficient quality. Average distance of the tumor to the CT/HA and SMA was 16.3 and 6.5 mm for PD and 12.7 and 11.0 mm for DP. Distance between the artery and the tumor did not influence the R0 resection rates (overall R0 > 1mm resection margin 64%) and median overall survival was 24.0 months after R0 resection and 13.5 months after R1 resection (log-rank test P < 0.05). Borderline resectable patients (n = 57) showed a median survival of 13.4 months, patients with their tumor 1-5mm distant to the closest artery (n = 65) and greater than 5 mm distance (n = 81) showed a median survival of 20.3 and 32.9 months respectively. Patients with 0-5 and greater than 5 mm distance between arteries and tumor showed a survival benefit from R0 resection (R0/R1 0-5mm 20.3/13.5 months; > 5mm 37.3/12.8 months) while R0 resected borderline resectable patients showed a similar survival than R1 resected patients (R0 12.7months, R1 15.1 months). Conclusions: The negative resection margins in borderline resectable patients not increase the survival when compared to R1 resected patients. Patients with primary R0 resection and initially large distance of the tumor to peripancreatic vasculature show a prolonged survival.