Aminocamptothecin in Treating Patients With Advanced or Recurrent Kidney Cancer

DISEASE CHARACTERISTICS: Histologically proven stage III, stage IV, or recurrent renal cell carcinoma Measurable disease No brain metastases PATIENT CHARACTERISTICS: Age: 18 and over Performance status: ECOG 0-2 Life expectancy: At least 3 months Hematopoietic: Platelet count at least 100,000/mm3 Absolute neutrophil count at least 1500/mm3 Hemoglobin at least 9.0 g/dL Hepatic: Bilirubin no greater than 1.5 mg/dL ALT and AST no greater than 2.5 times the institutional normal values Renal: Creatinine no greater than 1.5 mg/dL Other: Not pregnant or nursing Fertile patients must use effective contraception No uncontrolled systemic infection No other prior or concurrent malignancies except nonmelanoma skin cancer, carcinoma in situ of the cervix, or ductal carcinoma in situ of the breast that have been curatively treated No evidence of delirium, confusion, suicidal ideation, or untreated depression PRIOR CONCURRENT THERAPY: Biologic therapy: At least 30 days since prior cytokines and recovered No more than 1 prior treatment with cytokines (interleukin-2 or interferons) Chemotherapy: No prior cytotoxic chemotherapy No prior aminocamptothecin No other concurrent antineoplastic agents Endocrine therapy: At least 30 days since prior hormone therapy and recovered No more than 1 prior hormone therapy (tamoxifen or medroxyprogesterone) Radiotherapy: Prior radiotherapy allowed if indicator lesion and greater than 15% of marrow producing bone have not been irradiated Surgery: Recovered from prior surgery Other: At least 30 days since other investigational agents No concurrent investigational agents