Case Report: Medullary carcinoma of the pancreas with MLH1 promoter hypermethylation, induced deficient mismatch repair, successfully treated with an immune checkpoint inhibitor by Koushiro Ohtsubo, Shigeki Sato, Hiroyuki Sakaguchi, Hiroshi Kotani, Akihiro Nishiyama, Kaname Yamashita, Seiji Yano, Fumihito Toshima, Dai Inoue, Toshifumi Gabata, Hiroko Ikeda, Atsushi Watanabe, Kenji Notohara, Takao Fujisawa, Takao Fujisawa, Takao Fujisawa, Yoshiaki Nakamura, Yoshiaki Nakamura, Yoshiaki Nakamura, Takayuki Yoshino, Takayuki Yoshino, Takayuki Yoshino, Kunio Miyake, Kazuhiro Miwa, Shinji Takeuchi

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