Programmed death-ligand 1 expression in gastric cancer by the combined positive score using the PD-L1 IHC 28–8 pharmDx test: a single institution’s experience - Tomomi Hamaguchi; Kyoko Furusawa; Mamoru Watanabe; Kei Hayashi; Mitsuhiro Furuta; Yasuhiro Inokuchi; Satoshi Kobayashi; Makoto Ueno; Yuta Nakayama; Mie Tanabe; Junya Morita; Kyohei Kanematsu; et al. (Japanese Journal of Clinical Oncology, 2026)