Combination Chemotherapy Alone or With Radiation Therapy in Treating Children With Kidney Cancer

RATIONALE: Drugs used in chemotherapy use different ways to stop tumor cells from dividing so they stop growing or die. Radiation therapy uses high energy x-rays to damage tumor cells. It is not yet known whether combination chemotherapy alone or combination chemotherapy plus radiation therapy is more effective for childhood kidney cancer. PURPOSE: Phase III trial to compare the effectiveness of combination chemotherapy with or without radiation therapy in treating children who have kidney cancer.