OUTLINE: This is a randomized study. Patients are stratified by participating institution. The first group receives oral cyclophosphamide on days 1 through 14 and intravenous methotrexate and fluorouracil on days 1 and 8. Courses repeat every 4 weeks for a maximum of 6 courses. The second group receives intravenous mitoxantrone every 3 weeks for a maximum of 8 courses. Concomitant therapy with hepatotoxic or nephrotoxic drugs (e.g., NSAIDs) or corticosteroids (even as antiemetics) is not permitted in either group. Radiotherapy is allowed provided no more than 50% of the bone marrow is irradiated and at least 1 indicator lesion is unirradiated. Patients who complete therapy are followed every 3 months until disease progression.