External radiation is associated with limited improvement in overall survival in resected margin-negative stage IIB pancreatic adenocarcinoma

The absolute benefit of adjuvant external beam radiation therapy after a margin-negative resection in early stage pancreatic cancer has not been determined.We queried the National Cancer Data Base for patients with pathologic stage I-II pancreatic adenocarcinoma who underwent operative resection between 2004 and 2012. Multivariate Cox regression adjusted for age, race, comorbidities, facility type, location and volume, type of pancreatectomy,...