PRIOR CONCURRENT THERAPY: Biologic therapy: At least 2 weeks since prior epoetin alfa, filgrastim (G-CSF), or sargramostim (GM-CSF) No prior antiangiogenesis therapy No prior SU5416 No concurrent immunotherapy Chemotherapy: See Disease Characteristics No more than 1 prior systemic chemotherapy regimen allowed At least 4 weeks since prior systemic chemotherapy (6 weeks for mitomycin or nitrosourea) No prior high dose chemotherapy At least 6 months since prior gemcitabine and cisplatin and responsive No other concurrent chemotherapy Endocrine therapy: Not specified Radiotherapy: Not specified Surgery: At least 4 weeks since prior surgery Other: No other concurrent investigational agents