The goal of this study is assess the quality of life of advanced non-small cell lung cancer (NSCLC) patients who are undergoing first-line chemotherapy, analyze the current status and tendency of quality of life (QOL). The method is to use the Functional Assessment of Cancer Therapy-Lung (FACT-L) scales, assess the quality of life before the chemotherapy, after 1st cycle of chemotherapy and after 2nd cycle. After 3 time-points, investigators analyze all the subscales and constructs of FACT-L. The assumption is the quality of life will be better after 2 cycle of chemotherapy.