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Table 2. Primary Tumor (T)a

TXPrimary tumor cannot be assessed.
T0No evidence of primary tumor.
TisCarcinoma in situ.b
T1Tumor limited to the pancreas, ≤2 cm in greatest dimension.
T2Tumor limited to the pancreas, >2 cm in greatest dimension.
T3Tumor extends beyond the pancreas but without involvement of the celiac axis or the superior mesenteric artery.
T4Tumor involves the celiac axis or the superior mesenteric artery (unresectable primary tumor).

aReprinted with permission from AJCC: Exocrine and endocrine pancreas. In: Edge SB, Byrd DR, Compton CC, et al., eds.: AJCC Cancer Staging Manual. 7th ed. New York, NY: Springer, 2010, pp 241-9.
bThis also includes the "PanInIII" classification.