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Table 1. Primary Tumor (T)a

TXPrimary tumor cannot be assessed.
T0No evidence of primary tumor.
TisCarcinoma in situ.
TaNoninvasive verrucous carcinoma.b
T1aTumor invades subepithelial connective tissue without lymph vascular invasion and is not poorly differentiated (i.e., grade 3–4).
T1bTumor invades subepithelial connective tissue with lymph vascular invasion or is poorly differentiated.
T2Tumor invades corpus spongiosum or cavernosum.
T3Tumor invades urethra.
T4Tumor invades other adjacent structures.

aReprinted with permission from AJCC: Penis. In: Edge SB, Byrd DR, Compton CC, et al., eds.: AJCC Cancer Staging Manual. 7th ed. New York, NY: Springer, 2010, pp 447-55.
bBroad pushing penetration (invasion) is permitted; destructive invasion is against this diagnosis.