Purpose

This phase II trial is studying how well giving rituximab together with combination chemotherapy and 90-Yttrium ibritumomab tiuxetan works in treating patients with stage I or stage II lymphoma. Drugs used in chemotherapy, such as prednisone, cyclophosphamide, doxorubicin, and vincristine, work in different ways to stop cancer cells from dividing so they stop growing or die. Monoclonal antibodies such as rituximab and yttrium 90-Yttrium ibritumomab tiuxetan can locate cancer cells and either kill them or deliver radioactive cancer-killing substances to them without harming normal cells. Combining a monoclonal antibody with combination chemotherapy and a radiolabeled monoclonal antibody may kill more cancer cells.