Table 1.

International definitions of R-PDAC and BR-PDAC based on anatomical, biological and conditional aspects.

Type of Definition	Anatomical	Biological	Conditional
		No: R-Type A	No: R-Type A
R-PDAC	R-Type A
		Yes: BR-Type B	Yes: BR-Type C
		No: BR-Type A	No: BR-Type A
BR-PDAC	BR-Type A
		Yes: BR-Type AB	Yes: BR-Type AC

Anatomical definition: R-Type A: SMV/PV: no tumor contacts or unilateral. SMA, CA, CHA: no tumor contact; BR-Type A: SMV/PV: tumor contact ≥ 180° or bilateral narrowing/occlusion, not exceeding inferior border of duodenum. SMA, CA: tumor contact < 180° without deformity/stenosis. CHA: tumor contact, without contact with PHA and/or CA. Biological definition: CA 19-9 more than 500 IU/mL, regional lymph metastasis (biopsy or PET-CT). Conditional definitions: depressed performance status (PS = 2 or more).