2002 American Joint Committee on Cancer (AJCC) TNM Staging System for the Prostate

Tx: Primary tumor cannot be assessed
T0: No evidence of primary tumor
T1: Clinically inapparent tumor neither palpable nor visible by imaging
  T1a: Tumor incidental histologic finding in 5% or less of tissue resected
  T1b: Tumor incidental histologic finding in more than 5% of tissue resected
  T1c: Tumor identified by needle biopsy (e.g., because of elevated PSA)
T2: Tumor confined within the prostate
  T2a: Tumor involves one-half of one lobe or less
  T2b: Tumor involves more than one-half of one lobe but not both lobes
  T2c: Tumor involves both lobes
T3: Tumor extends through the prostatic capsule **
  T3a: Extracapsular extension (unilateral or bilateral)
  T3b: Tumor invades the seminal vesicle(s)
T4: Tumor is fixed or invades adjacent structures other than seminal vesicles: bladder neck, external sphincter, rectum, levator muscles, and/or pelvic wall

Note:Tumor found in one or both lobes by needle biopsy, but not palpable or reliably visible by imaging, is classified as T1c.
**Note: Invasion into the prostatic apex or into (but not beyond) the prostatic capsule is not classified as T3, but as T2.

Stage I: T1a N0 M0 G1
Stage II: T1a N0 M0 G2, 3-4, T1b N0 M0 Any G, T1c N0 M0 Any G, T1 N0 M0 Any G, T2 N0 M0 Any G
Stage III: T3 N0 M0 Any G
Stage IV: T4 N0 M0 Any G, Any T N1 M0 Any G, Any T Any N M1 Any G