Table 1. Primary Tumor (T)a
| TX | Primary tumor cannot be assessed. |
| T0 | No evidence of primary tumor. |
| Tis | Carcinoma in situ. |
| Ta | Noninvasive verrucous carcinoma.b |
| T1a | Tumor invades subepithelial connective tissue without lymph vascular invasion and is not poorly differentiated (i.e., grade 3–4). |
| T1b | Tumor invades subepithelial connective tissue with lymph vascular invasion or is poorly differentiated. |
| T2 | Tumor invades corpus spongiosum or cavernosum. |
| T3 | Tumor invades urethra. |
| T4 | Tumor 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. |
