Discordance of Mutation Statuses of Epidermal Growth Factor Receptor and K-ras between Primary Adenocarcinoma of Lung and Brain Metastasis oleh Kun-Ming Rau, Han-Ku Chen, Li-Yen Shiu, Tsai-Ling Chao, Yi-Ping Lo, Chin-Chou Wang, Meng-Chih Lin, Chao-Cheng Huang