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Table 2. High-Risk Features for Primary Tumor (T) Staging for Non-Eyelid Carcinoma

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.
Depth/invasion>2 mm thickness (Breslow thickness).
Clark level ≥IV.
Perineural invasion.
AnatomicPrimary site ear.
LocationPrimary site hair-bearing lip.
DifferentiationPoorly differentiated or undifferentiated.