Group II 
Microscopic tumor remaining after surgery.

Standard Treatment  These tumors are treated in the same manner as Group I lesions.

Five-Year Survival  65 percent 

Group III 
Tumors cannot be removed at initial surgery because they have infiltrated into surrounding tissues or lymph nodes , but have not shown evidence of spread to distant sites.

Standard Treatment  These patients are treated with similar combination chemotherapy and radiation after surgery, but may have a second opportunity at surgery to remove the tumor completely after it has decreased in size.

Five-Year Survival  45 percent 

Group IV 
The tumor has spread to distant sites at the time of diagnosis.