Tissue Procurement and Natural History Study of People With Non-Small Cell Lung Cancer, Small Cell Lung Cancer, Extrapulmonary Small Cell Cancer, Pulmonary Neuroendocrine Tumors, and Thymic Epithelial Tumors

* INCLUSION CRITERIA: * Individuals with histologically or cytologically confirmed NSCLC, SCLC, ESCC, PNET, and TET. * Individuals consulted in the Clinical Center without a definitive diagnosis, but clinically considered likely to have a malignancy of the above histologies, pending further tissue acquisition and/or pathology review. * Age greater than or equal to18 years. Children are excluded from the study, as the above thoracic malignancies are rare in this population. * Ability of subject to understand and the willingness to sign a written informed consent document. EXCLUSION CRITERIA: * Active symptomatic major organ disorder that would increase the risk of biopsy, including but not limited to ischemic heart disease, recent myocardial infarction, active congestive heart failure, pulmonary dysfunction. * Active concomitant medical or psychological illnesses that may increase the risk to the subject, at the discretion of the Principal Investigator. * Known HIV-positive individuals not on combination antiretroviral therapy are ineligible.