PRIOR CONCURRENT THERAPY: Biologic therapy: No prior IM-862 No concurrent biologic therapy (e.g., interleukin-2 and interferons) Chemotherapy: See Disease Characteristics Recovered from prior chemotherapy No concurrent antineoplastic cytotoxic agents Endocrine therapy: Not specified Radiotherapy: Recovered from prior radiotherapy Surgery: See Disease Characteristics Recovered from prior surgery Other: No other concurrent investigational drugs