After surgery, if you were originally in Group 1, and if the doctor believes the tumor(s) have responded well enough (specifically, if 90% or more of the tumor cells are dead when checked under the microscope), you will receive additional chemotherapy that is similar to what you received before surgery. This is described below as Regimen A. If the doctor does not believe the tumor(s) have responded well enough (if less than 90% of the tumor cells are dead when checked under the microscope), however, you will be assigned to Regimen B.