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Table 1. Definition of Terms

Term Definition 
Favorable siteOrbit; nonparameningeal head and neck; genitourinary tract other than kidney, bladder, and prostate; biliary tract.
Unfavorable siteAny site other than favorable.
T1Tumor confined to anatomic site of origin (noninvasive).
T2Tumor extension and/or fixation to surrounding tissue (invasive).
aTumor ≤5 cm in maximum diameter.
bTumor >5 cm in maximum diameter.
N0No clinical regional lymph node involvement.
N1Clinical regional lymph node involvement.
NXRegional lymph nodes not examined; no information.
M0No metastatic disease.
M1Metastatic disease.