| I [Note: Approximately 13% of all patients are in this Group.] |
A localized tumor that is completely removed with pathologically clear margins and no regional lymph node involvement. |
| II [Note: Approximately 20% of all patients are in this Group.] |
A localized tumor that is grossly removed with: (A) microscopic disease at the margin, (B) involved, grossly removed regional lymph nodes, or (C) both A and B. |
| III [Note: Approximately 48% of all patients are in this Group.] |
A localized tumor with gross residual disease after incomplete removal or biopsy only. |
| IV [Note: Approximately 18% of all patients are in this Group.] |
Distant metastases are present at diagnosis. |
