Table 1. Definition of Terms
| Term | Definition |
| Favorable site | Orbit; nonparameningeal head and neck; genitourinary tract other than kidney, bladder, and prostate; biliary tract. |
| Unfavorable site | Any site other than favorable. |
| T1 | Tumor confined to anatomic site of origin (noninvasive). |
| T2 | Tumor extension and/or fixation to surrounding tissue (invasive). |
| a | Tumor ≤5 cm in maximum diameter. |
| b | Tumor >5 cm in maximum diameter. |
| N0 | No clinical regional lymph node involvement. |
| N1 | Clinical regional lymph node involvement. |
| NX | Regional lymph nodes not examined; no information. |
| M0 | No metastatic disease. |
| M1 | Metastatic disease. |
