Comparing Efficacy between Anti-microtubule and Non-anti-microtubule as 3th Therapy after 2nd line EGFR-TKI therapy

This is an observational prospective study that investigates only daily practice. The prescription of anti-cancer medicine is separated from the decision to include the patient in this study. In addition, the assignment of the patient to a particular therapy or therapeutic strategy is not decided in advance by this study protocol, but falls within current practice. The patient who fulfils eligible criteria will be enrolled when starts to receive the second-line EGFR-TKI therapy. The frequency of tumor response evaluation by RECIST criteria follows the investigator’s discretion as daily practice.