Vaccine Therapy and GM-CSF in Treating Patients With CNS Lymphoma

RATIONALE: Vaccines made from a person's cancer proteins may help the body build an effective immune response to kill cancer cells. Colony-stimulating factors, such as GM-CSF, may increase the number of immune cells found in bone marrow or peripheral blood. Giving vaccine therapy together with GM-CSF may make a stronger immune response and kill more cancer cells. PURPOSE: This phase II trial is studying the side effects and how well giving vaccine therapy together with GM-CSF works in treating patients with CNS lymphoma.