1 Discovery and Preclinical Research Division, Taiho Pharmaceutical Co., Ltd, Tsukuba, Ibaraki, Japan; Cancer Vaccine Development Division, Kurume University Research Center for Innovative Cancer Therapy, Fukuoka, Japan. Electronic address: toshi-osada@taiho.co.jp.
2 Discovery and Preclinical Research Division, Taiho Pharmaceutical Co., Ltd, Tsukuba, Ibaraki, Japan.
3 Department of Otolaryngology-Head & Neck Surgery, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan.
4 Cancer Vaccine Development Division, Kurume University Research Center for Innovative Cancer Therapy, Fukuoka, Japan.