Combination Chemotherapy, Radiation Therapy, and Peripheral Stem Cell Transplantation in Treating Patients With Stage III or Stage IV Mantle Cell Lymphoma

RATIONALE: Drugs used in chemotherapy use different ways to stop cancer cells from dividing so they stop growing or die. Radiation therapy uses high-energy x-rays to damage cancer cells. Combining chemotherapy, radiation therapy, and peripheral stem cell transplantation may allow the doctor to give higher doses of chemotherapy drugs and kill more cancer cells. PURPOSE: Phase I/II trial to study the effectiveness of combination chemotherapy, radiation therapy, and peripheral stem cell transplantation in treating patients who have stage III or stage IV mantle cell lymphoma.