Incidence and comparative outcomes of periampullary cancer: A population‐based analysis demonstrating improved outcomes and increased use of adjuvant therapy from 2004 to 2012

Background and Objectives Periampullary adenocarcinoma (PAC) is stratified anatomically: ampullary adenocarcinoma (AA), distal cholangiocarcinoma (DCC), duodenal adenocarcinoma (DA), and pancreatic ductal adenocarcinoma (PDAC). We aimed to determine differences in incidence, prognosis, and treatment in stage‐matched PAC patients in a longitudinal study. Methods PAC patients were identified in The National Cancer Database from 2004 to 2012....