Table 1.

Criteria Defining Resectability Status in Japan Pancreas Society Classification 7th Edition (2016)

Resectable: R SMV/PV: no tumor contact or contact of <180° without occlusion SMA, CA, CHA: no tumor contact/invasion

Borderline resectable: BR (subclassified according to SMV/PV invasion alone or arterial invasion)

BR-PV (SMV/PV invasion alone) SMV/PV: tumor contact/invasion of ≥180°/occlusion, not exceeding the inferior border of the duodenum SMA, CA, CHA: no tumor contact/invasion

BR-A (arterial invasion) SMA, CA: tumor contact/invasion of <180° without deformity or narrowing CHA: tumor contact/invasion without showing tumor contact/invasion of the PHA and/or CA (cases of contact/invasion of both PV and peripancreatic arteries are considered BR-A)

Unresectable: UR (subclassified according to the presence or absence of distant metastases)

UR-LA (locally advanced) SMV/PV: tumor contact/invasion of ≥180°/occlusion, exceeding the inferior border of the duodenum SMA, CA: tumor contact/invasion of ≥180° CHA: tumor contact/invasion showing tumor contact/invasion of the PHA and/or CA AO: tumor contact or invasion

UR-M (metastasis) Distant metastasis including non-regional lymph node metastasis.

SMV, superior mesenteric vein; PV, portal vein; SMA, superior mesenteric artery; CA, celiac artery; CHA, common hepatic artery; PHA, proper hepatic artery; AO, aorta.