This study will evaluate the safety and effectiveness of an experimental cancer vaccine for mantle cell lymphoma-a form of cancer of the white blood cells called lymphocytes. Although standard treatments for lymphoma may achieve disease remission, none provides a cure.

Patients with mantle cell lymphoma 18 years and older who have not been treated previously with chemotherapy may participate in this study. Candidates will be screened for eligibility with a medical history and physical examination. Other tests that may be required include blood and urine tests; lung function studies; imaging tests such as magnetic resonance imaging, computed tomography and X-rays; and biopsy (surgical removal of a small tissue sample) of tumor, bone marrow, or other tissue.

Patients enrolled in the study will begin treatment with chemotherapy designed to reduce disease to a minimum-that is, to achieve remission or shrink the tumor as much as possible. Chemotherapy will be administered on an outpatient basis over a period of around 12 to 18 weeks in 3-week cycles as follows: prednisone by mouth on days 1 through 5; etoposide, doxorubicin and vincristine intravenously through (a vein) on days 1 through 5; and cyclophosphamide intravenously on day 5. Starting day 6, patients receive no chemotherapy for 16 days. In addition, an antibody called rituximab, which attaches to lymphoma cells and may increase the effectiveness of the chemotherapy, will be given on day 1 of the cycle. Patients will also receive a protein called G-CSF starting day 6 of the cycle and continuing until the white blood cell count recovers or until day 19. G-CSF is naturally produced by bone marrow and may boost the immune system. The chemotherapy drugs and rituximab are infused through a vein by means of a lightweight portable pump, which patients are taught how to use. Patients are also how taught how to give themselves G-CSF injections under the skin, similar to insulin injections.

The first vaccination will be given at least 3 months after chemotherapy ends and will be repeated every 4 weeks for a maximum of 5 vaccinations. The vaccinations will be given in the clinic. Patients will also receive daily injections of GM-CSF, a growth factor naturally produced by bone marrow that can boost the immune system. These injections will be given the day of the vaccination and for the next 3 days.

When vaccine therapy is completed, patients who were treated successfully will be followed with periodic clinic visits for follow-up examinations and tests. Patients in whom the lymphoma did not disappear entirely or who have a recurrence of disease will be advised of further treatment possibilities.