RATIONALE: Everolimus may stop the growth of cancer cells by blocking some of the enzymes needed for cell growth. Monoclonal antibodies, such as rituximab, can block cancer cells in different ways. Some block the ability of cancer cells to grow and spread. Others find cancer cells and help kill them or carry cancer-killing substances to them. Drugs used in chemotherapy, such as cyclophosphamide, doxorubicin hydrochloride, vincristine sulfate, and prednisone, work in different ways to stop the growth of cancer cells, either by killing the cells or stopping them from dividing. Giving everolimus together with rituximab, cyclophosphamide, doxorubicin hydrochloride, vincristine sulfate, and prednisone may kill more cancer cells.