PRIOR CONCURRENT THERAPY: Must have recovered from toxic effects of all prior therapy Biologic therapy: Prior vaccinia immunization required No concurrent biologic therapy No concurrent immunotherapy Chemotherapy: At least 4 weeks since prior chemotherapy (6 weeks since prior nitrosoureas or mitomycin) No concurrent chemotherapy Endocrine therapy: Physiologic replacement of steroids allowed No concurrent hormonal therapy Radiotherapy: No prior radiotherapy to more than 50% of all nodal groups Surgery: At least 3 weeks since any prior major surgery