Pretreatment neutrophil–lymphocyte ratio as a prognostic factor in recurrent/metastatic head and neck cancer treated with pembrolizumab by Yuki Kasahara, Ken Saijo, Reio Ueta, Ryunosuke Numakura, Keiju Sasaki, Yuya Yoshida, Sakura Taniguchi, Kota Ouchi, Keigo Komine, Hiroo Imai, Hidekazu Shirota, Masanobu Takahashi, Chikashi Ishioka

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