[1] Natl Canc Ctr, Div Thorac Oncol, Tokyo, Japan
[2] Natl Canc Ctr Hosp East, Div Thorac Oncol, Kashiwa, Chiba, Japan
[3] Chiba Univ, Dept Med Oncol, Chiba, Japan
[4] Mitsui Mem Hosp, Dept Resp Med, Tokyo 101, Japan
[5] Nippon Med Coll Hosp, Div Pulm Med Infect & Oncol, Dept Internal Med, Tokyo, Japan