Primary tumor (T)*
TX: Primary tumor cannot be assessed
T0: No evidence of primary tumor
Tis: Carcinoma in situ or PanInIII
T1: Tumor limited to the pancreas and ≤2 cm in greatest diameter
T2: Tumor limited to the pancreas and >2 cm in greatest diameter
T3: Tumor extends beyond the pancreas but does not involve the celiac axis or SMA
T4: Tumor involves the celiac axis or SMA
Regional lymph nodes (N)
NX: Regional lymph nodes cannot be assessed
N0: No regional lymph node involvement
N1: Regional lymph node metastases
Distant metastases (M)
M0: No distant metastases
M1: Distant metastases
Stage grouping based on TNM classification
0	T0, Tis	N0	N0
I	T1 or T2	N0	M0
II	T3	N0	M0
	T1–T3	N1	M0
III	T4	Any N	M0
IV	Any T	Any N	M1

^*Primary tumor was assessed by contrast-enhanced CT scan.