Table 1. American Joint Committee on Cancer (AJCC) Pancreatic Cancer Staging, SEER Historic Staging, and Technical Resectability.

PRIMARY TUMOR (P)
TX: Primary tumor cannot be assessed
T0: No evidence of primary tumor
Tis: Carcinoma in situ
T1: Tumor is limited to the pancreas and is 2 cm or less in greatest dimension
T2: Tumor is limited to the pancreas and is more than 2 cm in greatest dimension
T3: Tumor extends beyond the pancreas without involvement of the celiac axis or superior mesenteric artery
T4: Tumor involves the celiac axis or the superior mesenteric artery (unresectable primary tumor)
REGIONAL LYMPH NODES (N)
NX: Regional lymph nodes cannot be assessed
N0: No regional lymph node metastasis
N1: Regional lymph node metastasis
DISTANT METASTASIS (M)
MX: Distant metastasis cannot be assessed
M0: No distant metastasis
M1: Distant metastasis
AJCC STAGING GROUPS	SEER HISTORIC STAGING	RESECTABILITY
Stage 0: Tis, N0, M0	Localized	Resectable
Stage IA: T1, N0, M0	Localized	Resectable
Stage IB: T2, N0, M0	Localized	Resectable
Stage IIA: T3, N0, M0	Regional	Potentially resectable*
Stage IIB: T1-3, N1, M0	Regional	Potentially resectable*
Stage III: T4, any N, M0	Regional	Unresectable
Stage IV: Any T, any N, M1	Distant	Unresectable

^*Resectable if no major portal/superior mesenteric venous involvement or major retroperitoneal involvement present (locally advanced disease).