| TX | Primary tumor cannot be assessed |
| T0 | No evidence of primary tumor |
| T1 | Clinically inapparent tumor that is not palpable T1a – tumor incidental histological finding in 5% or less of tissue resected T1b – tumor incidental histological finding in more than 5% of tissue resected T1c – tumor identified by needle biopsy |
| T2 | Tumor that is palpable and confined to prostate T2a – tumor involves one half of one lobe or less T2b – tumor involves more than half of one lobe but not both lobes T2c – tumor involves both lobes |
| T3 | Tumor extends through the prostate capsule T3a – extracapsular extension (uni or bilateral) including microscopic bladder neck involvement T3b – tumor invades seminal vesicle(s) |
| T4 | Tumor is fixed or invades adjacent structures other than seminal vesicles – external sphincter, rectum, levator muscles and/or pelvic wall |
