- Patients must have histologically or cytologically proven primary non-small cell lung cancer (adenocarcinoma, large cell carcinoma, squamous or unspecified); disease must be stage IV; disease may be either newly diagnosed or recurrent after previous surgery and/or irradiation; patients with additional lesions in an ipsilateral non-primary lobe without M1a or M1b disease will not be considered to have stage IV disease and are not eligible