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Table 1. Primary Tumor (T) for Non-Eyelid Carcinomaa,b

TXPrimary tumor cannot be assessed.
T0No evidence of primary tumor.
TisCarcinoma in situ.
T1Tumor ≤2 cm in greatest dimension with <2 high-risk features.c
T2Tumor >2 cm in greatest dimension.
or
Tumor any size with ≥2 high-risk features.c
T3Tumor with invasion of maxilla, mandible, orbit, or temporal bone.
T4Tumor with invasion of skeleton (axial or appendicular) or perineural invasion of skull base.

aReprinted with permission from AJCC: Cutaneous squamous cell carcinoma and other cutaneous carcinomas. In: Edge SB, Byrd DR, Compton CC, et al., eds.: AJCC Cancer Staging Manual. 7th ed. New York, NY: Springer, 2010, pp 301-14.
bExcludes cutaneous squamous cell carcinoma of the eyelid.
cHigh-risk features for the primary tumor (T) staging.