Department of Thoracic Oncology;
Kanagawa Cancer Center;
Yokohama;
Japan;
Department of General Medicine;
Kanagawa Prefectural Ashigarakami-Hospital;
Matsuda;
Japan;
Department of Pulmonology;
Yokohama City University Graduate School of Medicine;
Yokohama;
Japan;
Pemetrexed; Gefitinib; EGFR; Mutation; Non-Small; Cell; Lung; Cancer; Chemotherapy;