Combination Chemotherapy in Treating Patients With Prostate Cancer That Has Not Responded to Hormone Therapy

DISEASE CHARACTERISTICS: Histologically proven adenocarcinoma of the prostate that is chemotherapy naive and refractory to hormonal therapy with combined androgen blockade No concurrent antiandrogen therapy withdrawal: Must continue antiandrogen therapy until completion of study OR Must discontinue flutamide at least 4 weeks before or bicalutamide at least 8 weeks before study enrollment, and must have disease progression off antiandrogen therapy, defined by serial increase in PSA (at least 2 measurements taken at least 2 weeks apart) or measurable tumor Concurrent LHRH antagonist allowed if no prior orchiectomy No minimum PSA level required Measurable or evaluable disease An increase in PSA or pain without measurable or evaluable disease does not constitute hormone refractory disease PATIENT CHARACTERISTICS: Age: 18 and over Performance status: Karnofsky 60-100% ECOG 0-2 Life expectancy: At least 6 months Hematopoietic: Absolute neutrophil count at least 1,500/mm3 Platelet count at least 100,000/mm3 Hemoglobin at least 10 g/dL Hepatic: SGOT and SGPT no greater than 2 times upper limit of normal Bilirubin no greater than 2.0 mg/dL Renal: Creatinine no greater than 2.0 mg/dL Cardiovascular: LVEF normal No impaired cardiac status (e.g., history of severe heart disease, cardiomyopathy, or congestive heart failure) Other: No active infection, defined by the following: Clinical syndrome consistent with a viral or bacterial infection (e.g., influenza, upper respiratory infection, or urinary tract infection) Fever with a clinical site of infection identified Microbiologically documented infection including, but not limited to, bacteremia or septicemia HIV negative No other malignancy within the past 5 years except surgically cured basal cell or squamous cell skin cancer No psychiatric, addictive, or other disorder that would preclude informed consent or compliance No hypersensitivity to E. coli derived proteins or drugs formulated with polysorbate 80 (e.g., human insulin) PRIOR CONCURRENT THERAPY: Biologic therapy: No concurrent WBC transfusions No other concurrent biologic therapy Chemotherapy: See Disease Characteristics No other concurrent chemotherapy Endocrine therapy: See Disease Characteristics Radiotherapy: At least 4 weeks since prior radiotherapy Surgery: See Disease Characteristics Other: No other concurrent investigational agent No concurrent acetaminophen for fever prophylaxis