Table 1. Primary Tumor (T) for Non-Eyelid Carcinomaa,b
| TX | Primary tumor cannot be assessed. |
| T0 | No evidence of primary tumor. |
| Tis | Carcinoma in situ. |
| T1 | Tumor ≤2 cm in greatest dimension with <2 high-risk features.c |
| T2 | Tumor >2 cm in greatest dimension. |
| or |
| Tumor any size with ≥2 high-risk features.c |
| T3 | Tumor with invasion of maxilla, mandible, orbit, or temporal bone. |
| T4 | Tumor 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. |
