Table 1. Definitions of TNM Stage I
| Stage | TNM | Description |
| I | T1a, N0, M0, G1 | T1a = Tumor incidental histologic finding in ≤5% of tissue resected. |
| N0 = No regional lymph node metastasis. |
| M0 = No distant metastasis.a |
| G1 = Well differentiated (slight anaplasia) (Gleason score of 2–4). |
| T = Primary tumor; N = Regional lymph nodes; M = Distant metastasis; G = Histopathologic grade. |
| Reprinted with permission from AJCC: Prostate. In: Edge SB, Byrd DR, Compton CC, et al., eds.: AJCC Cancer Staging Manual. 7th ed. New York, NY: Springer, 2010, pp 457-68. |
| The explanation for superscript a is at the end of Table 4. |
