Expression of placenta-specific 1 and its potential for eliciting anti-tumor helper T-cell responses in head and neck squamous cell carcinoma oleh Ryusuke Hayashi, Toshihiro Nagato, Takumi Kumai, Kenzo Ohara, Mizuho Ohara, Takayuki Ohkuri, Yui Hirata-Nozaki, Shohei Harabuchi, Akemi Kosaka, Marino Nagata, Yuki Yajima, Syunsuke Yasuda, Kensuke Oikawa, Michihisa Kono, Kan Kishibe, Miki Takahara, Akihiro Katada, Tatsuya Hayashi, Esteban Celis, Yasuaki Harabuchi, Hiroya Kobayashi