PRIOR CONCURRENT THERAPY: Biologic therapy: No prior biologic therapy for non-small cell lung cancer No concurrent biologic response modifiers Concurrent filgrastim (G-CSF) allowed only for persistent neutropenia despite dose reductions in prior course Chemotherapy: No prior chemotherapy for non-small cell lung cancer Endocrine therapy: No concurrent hormonal therapy No concurrent tamoxifen Radiotherapy: See Disease Characteristics At least 2 weeks since prior radiotherapy No concurrent radiotherapy Surgery: See Disease Characteristics Recovered from prior oncologic or other major surgery Other: No other concurrent anticancer therapy No other concurrent investigational agents No concurrent drugs with known significant 3A4 inhibitory effects (i.e., ketoconazole, itraconazole, troleandomycin, erythromycin, diltiazem, verapamil) No concurrent hydroxychloroquine, amiodarone, or chlorpromazine No concurrent topical eye medication