OUTLINE: Patients receive one of three HER-2/neu peptide vaccine formulations that also contain sargramostim (GM-CSF) as the vaccine adjuvant. Each vaccine is studied in 20 patients. A maximum of 3 patients receive a vaccine each month for 6 months to monitor the potential toxicity associated with sequential immunizations. Patients receive a follow-up evaluation 1 month after the last vaccination. Those patients who have an immune response related to the vaccine will continue to have immunologic evaluations performed every 2 months while immune responses can still be detected.