Studying Tumor Tissue Samples From Patients With Early-Stage Non-Small Cell Lung Cancer

Inclusion Criteria: * Registration to CALGB-140202 * The subject population to be studied in this protocol includes patients selected from CALGB-140202; all such patients have signed a written informed consent document meeting all federal, state and institutional guidelines as part of entry into that trial; the CALGB does not require that a separate consent form be signed for this study * All samples to be studied were obtained and stored as part of CALGB-140202; the material and data obtained from the patient's protocol record will be used to obtain appropriate clinical information; in no instance will the patient be contacted directly * Tumor specimens need to have 40% tumor content to be included