Toshio Shimizu and Kazuhiko Nakagawa
Lung cancer is a leading cause of cancer death worldwide. Lung cancer accounts for over 1 million mortalities annually and non-small cell lung cancer (NSCLC) accounts for almost 85% of all cases. Epidermal growth factor receptor (EGFR) mutations are found in approximately 10% and 30% of patients with NSCLC in North American/European and East Asian countries, respectively.