Primary Tumor (T)
TX Primary tumor cannot be assessed T0 No evidence of primary tumor T1 Clinically inapparent tumor not palpable nor visible by imaging T1a Tumor incidental histologic finding in 5% or less of tissue resected by TURP. T1b Tumor incidental histologic finding in more than 5% of tissue resected by TURP. T1c Tumor identified by needle biopsy (e.g. because of elevated PSA) T2 Palpable tumor but confined within the prostate T2a Tumor involves one half of a lobe or less. T2b Tumor involves more than half a lobe, but not both lobes. T2c The tumor involves both lobes. T3 Tumor extends through the prostatic capsule T3a Unilateral extracapsular extension T3b Bilateral extracapsular extension T3c Tumor invades the seminal vesicle(s) T4 Tumor is fixed or invades adjacent structures other than seminal vesicles. T4a Tumor invades any of bladder neck, external sphincter, rectum. T4b Tumor invades levator muscles, and/or is fixed to the pelvic wall.
Primary Tumor, Pathologic (pT)
pT2 Organ confined pT2a Unilateral pT2b Bilateral pT3 Extraprostatic extension pT3a Extraprostatic extension pT3b Seminal vesicle invasion pT4 Invasion of bladder, rectum
Regional Lymph Nodes (N)
NX Regional lymph nodes cannot be assessed N0 No regional lymph node metastasis N1 Metastasis in a single lymph node, 2 cm or smaller N2 Metastasis to one or more lymph nodes 2 cm or larger, but none larger than 5 cm in greatest diameter. N3 Metastasis to a lymph node greater than 5 cm in greatest diameter.
Distant Metastasis (M)
MX Distant metastasis cannot be assessed M0 No distant Metastasis M1 Distant metastasis M1a Nonregional lymph nodes M1b Bone(s) M1 Other site(s)