[P57] Poster Session 57　Gastrointestinal Cancer（Gastric Cancer 2）

[P57-4] The prevalence of PD-L1 expression in HER2-positive advanced gastric cancer

^○Keitaro Shimozaki^1,2, Takeru Wakatsuki¹, Noriko Yamamoto³, Hiroki Osumi¹, Izuma Nakayama¹, Akira Oki¹, Daisuke Takahari¹, Mariko Ogura¹, Eiji Shinozaki¹, Keisho Chin¹, Kensei Yamaguchi¹ (1.Department of Gastroenterological chemotherapy, Cancer Institute Hospital of JFCR, 2.Division of Gastroenterology and Hepatology, Department of Internal Medicine, Keio University School of Medicine, 3.Department of Pathology, Cancer Institute Hospital of Japanese Foundation for Cancer Research)