Table 2. Definitions of TNM Stages IA and IBa
| Stage | TNM | Description | Illustration |
| 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. |
| IA | T1, N0, M0 | T1 = Tumor limited to the pancreas, ≤2 cm in greatest dimension. | |
| N0 = No regional lymph node metastasis. |
| M0 = No distant metastasis. |
| IB | T2, N0, M0 | T2 = Tumor limited to the pancreas, >2 cm in greatest dimension. |
| N0 = No regional lymph node metastasis. |
| M0 = No distant metastasis. |