A phase II trial of gefitinib monotherapy in Chemotherapy-Naïve patients of 75 years or older with advanced non-small cell lung cancer

Noriyuki Ebi, Hiroshi Semba, Sho J.I. Tokunaga, Koichi Takayama, Hiroshi Wataya, Takashige Kuraki, Hidehiko Yamamoto, Shin J.I. Akamine, Isamu Okamoto, Yoichi Nakanishi