Conversion Surgery After Chemotherapy Plus Nivolumab as the First-Line Treatment for Unresectable Advanced or Recurrent Gastric Cancer and a Biomarker Study Using the Gustave Roussy Immune Score: A Multicenter Study

Nobuhiro Nakazawa, Makoto Sohda, Nobuhiro Hosoi, Takayoshi Watanabe, Yuji Kumakura, Toshiki Yamashita, Naritaka Tanaka, Kana Saito, Akiharu Kimura, Kengo Kasuga, Kenji Nakazato, Daisuke Yoshinari, Hisashi Shimizu, Yasunari Ubukata, Hisashi Hosaka, Akihiko Sano, Makoto Sakai, Hiroomi Ogawa, Ken Shirabe, Hiroshi Saeki