Good Clinical Response to Erlotinib in a Non-Small Cell Lung Cancer Patient Harboring Multiple Brain Metastases and a Double Active Somatic Epidermal Growth Factor Gene Mutation. - Masago K; Togashi Y; Fukudo M; Terada T; Irisa K; Sakamori Y; Fujita S; Kim YH; Mio T; Inui KI; Mishima M (Case reports in oncology, 2010)