At approximately 3-6 weeks after surgery, patients receive B7-1 gene-modified autologous tumor cell vaccine subcutaneously (SC) once on days 1, 29, and 57. At 6 weeks after the first vaccination, patients receive interleukin-2 (IL-2) SC five days a week for 6 weeks (days 43-82). Patients with stable or responding disease after day 106 may receive additional vaccinations in the absence of disease progression or unacceptable toxicity.