Kyoichi Kaira1, Hiroshi Kagamu2. 1. Department of Respiratory Medicine, Comprehensive Cancer Center, International Medical Center, Saitama Medical University, Hidaka-City, Saitama, Japan. Electronic address: kkaira1970@yahoo.co.jp. 2. Department of Respiratory Medicine, Comprehensive Cancer Center, International Medical Center, Saitama Medical University, Hidaka-City, Saitama, Japan.