Staging of Anal Cancer

Staging of Anal Cancer

Unlike colorectal cancer staging, anal cancer is staged based upon the size of the tumor. But similar to most all tumors, the presence of lymph node involvement and metastatic disease worsens the prognosis.

  • Stage I: T1 (tumor less that 2 cm) N0 (nodes negative)
  • Stage II: T2(tumor 2-5 cm) or T3 (>5 cm) N0
  • Stage III: Any T stage, but N1-2, M0 (no metastatic disease)
  • Stage IV: Any T or N stage, but M1 (metastatic disease)

Similar to rectal cancer the most common sites of metastasis are the liver and lungs.