PRIOR CONCURRENT THERAPY: Biologic therapy: At least 4 weeks since prior biologic therapy At least 1 (but no more than 2) prior biologic regimen(s) (i.e., interleukin-2, interferon alfa, or combination) and recovered Regimen defined as at least 8 weeks of treatment Prior sargramostim allowed Chemotherapy: No prior chemotherapy Endocrine therapy: At least 4 weeks since prior hormonal therapy (i.e., megestrol or tamoxifen) and recovered Radiotherapy: No prior radiotherapy to study lesions At least 4 weeks since prior radiotherapy and recovered No concurrent palliative radiotherapy Surgery: Prior nephrectomy allowed Recovered from any recent surgery