2. Patients must have tumor tissue available, either from an archival specimen, or from a recent biopsy, to be analyzed for EGFR mutation. Patients must sign consent for the umbrella protocol prior testing for EGFR mutation. Patients will be eligible if they have an EGFR-sensitive mutation, OR if they have an EGFR-resistant mutation, OR if they do not have an EGFR mutation, but have benefited from EGFR inhibitor therapy (including either >/= 4 months of stable disease [SD] OR a >/= partial response [PR]).