Combination of gemcitabine and anti-PD-1 antibody enhances the anticancer effect of M1 macrophages and the Th1 response in a murine model of pancreatic cancer liver metastasis =============================================================================================================================================================================== * Tuyen Thuy Bich Ho * Alessandro Nasti * Akihiro Seki * Takuya Komura * Hiiro Inui * Takashi Kozaka * Yoji Kitamura * Kazuhiro Shiba * Taro Yamashita * Tatsuya Yamashita * Eishiro Mizukoshi * Kazunori Kawaguchi * Takashi Wada * Masao Honda * Shuichi Kaneko * Yoshio Sakai