Molecular alterations and PD-L1 expression in non-ampullary duodenal adenocarcinoma: Associations among clinicopathological, immunophenotypic and molecular features. - Watari, Jiro; Mitani, Seiichiro; Ito, Chiyomi; Tozawa, Katsuyuki; Tomita, Toshihiko; Oshima, Tadayuki; Fukui, Hirokazu; Kadowaki, Shigenori; Natsume, Seiji; Senda, Yoshiki; Tajika, Masahiro; Hara, Kazuo; et al. (Scientific Reports, 2019)