OUTLINE: This is a single arm, nonrandomized study. Patients receive vinblastine as an IV bolus once every 2 weeks. Interleukin-2 is administered by subcutaneous injection on days 1-5 each week for 9 weeks. Sargramostim (granulocyte-macrophage colony-stimulating factor; GM-CSF) is administered by subcutaneous injection on days 1-5 each week for 9 weeks. Each 9 week cycle is followed by 3 weeks of rest. Patient may continue treatment for a maximum of 5 cycles in the absence of disease progression. Patients are assessed every 12 weeks for the duration of treatment.