Margin status, recurrence pattern, and prognosis after resection of pancreatic cancer

Background. Controversy persists as to whether positive operative margins are an independent prognostic factor for resected pancreatic cancer. This study evaluated the impact of the resection margin status on the patterns of recurrence and prognosis after resection for pancreatic cancer. Methods. A total of 208 patients with pancreatic cancer who underwent resection with curative intent were studied retrospectively. All patients underwent pancreatectomy (164 pancreatoduodenectomies, 42 distal pancreatectomies, and 2 total pancreatectomies) intended to achieve R0 resection. They were divided into three groups on the basis of the following margin status: R->1 mm, R0-1 mm, and R-0 mm. The postoperative survival and recurrence patterns were evaluated in relation to the margin status. Multivariate analyses were performed to evaluate the factors influencing the overall survival. Results. The resection margin was R->1 mm in 134 patients (65%), R0-1 mm in 40(19%), and R-0 mm in 34 patients (16%). The margin status correlated with the rate of local recurrence, 8 % in R->1 mm, 20%, in R0-1 mm, and 50% in R-0 mm, patients. In contrast, the incidence of recurrence at other sites, such as the lymph nodes, peritoneum, liver and other distant organs, were almost identical among the three groups. The median survival time was 26 months in R->1 mm, 30 months in R0-1 mm, and 23 months in R-0 mm patients (P = not significant). The multivariate analyses revealed that lymph node metastases and poor differentiation were correlated with poor survival. Conclusion. In the setting of pancreatectomy, when we evaluated the definitions of R0 resection, the margin status influenced the local recurrence rate but had no impact. on the patients' survival.