The purpose of this study is to try to learn more about how small molecule kinase inhibitors work in treating lung cancer. Some early studies have shown that gefitinib, erlotinib and similar drugs are more likely to work if a particular DNA change (also known as a mutation) is found in a protein that is important in lung cancer. This protein is called the epidermal growth factor receptor (EGFR). Since small molecule kinase inhibitors sometimes stop working, we would like to examine your tumor to learn why these medicines are not working as well. Your tumor will be examined for a variety of things including changes in the DNA of the EGFR. We will also sequence parts of the genes for HER2, HER3, HER4, and KRAS, other proteins thought to be important in lung cancer.