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Comparison of 4- and 4 plus-courses S-1 administration as adjuvant chemotherapy for pancreatic ductal adenocarcinoma. <i>BMC Cancer<\/i>, <b>21<\/b>, 612 (2021).","DOI":"10.1186\/s12885-021-08380-9"},{"key":"5","doi-asserted-by":"crossref","unstructured":"5) Tomimaru Y, Eguchi H, Inoue Y, <i>et al.<\/i> Impact of S-1 adjuvant chemotherapy longer than 6 months on survival in patients with resected pancreatic cancer: a nationwide survey by the Japan Pancreas Society based on real-world data. <i>Cancer<\/i>, <b>129<\/b>, 728\u2013739 (2023).","DOI":"10.1002\/cncr.34580"},{"key":"6","doi-asserted-by":"crossref","unstructured":"6) Kayashima H, Itoh S, Shimokawa M, Hayashi H, Takamori H, Fukuzawa K, Ninomiya M, Araki K, Yamashita YI, Sugimachi K, Uchiyama H, Morine Y, Utsunomiya T, Uwagawa T, Maeda T, Baba H, Yoshizumi T. 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