Does adjuvant radiation provide any survival benefit after an R1 resections for pancreatic cancer?

Background The benefit of adding external beam radiation to adjuvant chemotherapy in patients that have undergone a margin positive resection for early stage, pancreatic ductal adenocarcinoma has not been determined definitively. Methods The National Cancer Data Base was queried to evaluate the utility of adjuvant radiation in patients with pathologic stage I–II pancreatic ductal adenocarcinoma who underwent upfront pancreatoduodenectomy with a...