Saka B, Balci S, Basturk O, Bagci P, Postlewait LM, Maithel S, Knight J, El-Rayes B, Kooby D, Sarmiento J, Muraki T, Oliva I, Bandyopadhyay S, Akkas G, Goodman M, Reid MD, Krasinskas A, Everett R, Adsay V. Pancreatic Ductal Adenocarcinoma is Spread to the Peripancreatic Soft Tissue in the Majority of Resected Cases, Rendering the AJCC T-Stage Protocol (7th Edition) Inapplicable and Insignificant: A Size-Based Staging System (pT1: =2, pT2: >2-=4, pT3: >4 cm) is More Valid and Clinically Relevant. Ann Surg Oncol. 2016 06; 23(6):2010-8.