Stage 0is includes: (Tis, N0, M0); (Tis pu, N0, M0); (Tis pd, N0, M0). Tis: Carcinoma in situ. Tis pu: Carcinoma in situ, involvement of the prostatic urethra. Tis pd: Carcinoma in situ, involvement of the prostatic ducts. N0: No regional lymph node metastasis. M0: No distant metastasis. (AJCC 7th ed.) [from
NCI]