PRIOR CONCURRENT THERAPY: Biologic therapy: Not specified Chemotherapy: See Disease Characteristics No prior marimastat, batimastat, bleomycin, or busulphan No more than 1 cytotoxic chemotherapy regimen for non-small cell lung cancer Endocrine therapy: Not specified Radiotherapy: See Disease Characteristics Surgery: See Disease Characteristics Other: At least 4 weeks since any investigational drug therapies