Table 1.

Different international classifications of locally advanced and borderline resectable PDAC (taken by JA Pietryga and DE Morgan (2015), Journal of Gastrointestinal Oncology, vol. 6, no. 4).

Anatomy	NCCN 2014	AHPBA/SSAT/SSO	MD Anderson Cancer Center	ISGPS	ACTO
Superior mesenteric vein/portal vein	Involvement with distortion/narrowing and/or occlusion amenable to reconstruction	Abutment encasement or short-segment occlusion amenable to reconstruction	Short-segment occlusion amenable to reconstruction	Involvement with distortion/narrowing and/or occlusion amenable to reconstruction	Tumor-vessel interface ≥180° and/or occlusion amenable to reconstruction
Superior mesenteric artery	Abutment (≤180°)	Abutment (≤180°)	Abutment (≤180°)	Abutment (≤180°)	Tumor-vessel interface <180°
Common hepatic artery	Abutment or short-segment encasement	Abutment or short-segment encasement	Short-segment encasement/abutment	Abutment or short-segment encasement	Short-segment tumor-vessel interface (any degree) amenable to reconstruction
Celiac artery	No abutment or encasement	No abutment/encasement	No abutment or encasement	No abutment or encasement	Tumor-vessel interface <180°

NCCN: National Comprehensive Cancer Network; AHPBA/SSAT/SSO: American Hepato-Pancreato-Biliary Association/Society for Surgery of the Alimentary Tract/Society of Surgical Oncology; ISGPS: International Study Group of Pancreatic Surgery; ACTO: Alliance for Clinical Trials in Oncology.