1. A Randomized Phase II Study of S-1 Adjuvant Chemotherapy With or Without Hochu-ekki-to, a Japanese Herbal Medicine, for Stage II/III Gastric Cancer: The KUGC07 (SHOT) Trial
   Hiroshi Okabe et al, 2019, Front. Oncol. CrossRef
2. Randomized feasibility study of S-1 for adjuvant chemotherapy in completely resected Stage IA non–small-cell lung cancer: results of the Setouchi Lung Cancer Group Study 0701
   Junichi Soh et al, 2016, Jpn. J. Clin. Oncol. CrossRef
3. Phase II study of S-1 in patients with previously-treated invasive thymoma and thymic carcinoma: North Japan Lung Cancer Study Group Trial 1203
   Yoko Tsukita et al, 2019, Lung Cancer CrossRef
4. A multicenter, phase I/II trial of biweekly S-1, leucovorin, oxaliplatin and gemcitabine in metastatic pancreatic adenocarcinoma–TCOG T1211 study
   Nai-Jung Chiang et al, 2020, European Journal of Cancer CrossRef
5. Phase 2 Trial of Adjuvant Chemotherapy With S − 1 for Node-Positive Biliary Tract Cancer (N-SOG 09)
   Kazuaki Seita et al, 2020, Ann Surg Oncol CrossRef
6. Comparison of 2- and 4-week S-1 administration as adjuvant chemotherapy for advanced gastric cancer
   Koichi Ogawa et al, 2020, Int J Clin Oncol CrossRef
7. Comparison of 4- and 4 plus-courses S-1 administration as adjuvant chemotherapy for pancreatic ductal adenocarcinoma
   Bo Li et al, 2021, BMC Cancer CrossRef
8. Efficacy and Safety of Additional S-1 Chemotherapy to S-1 plus Oxaliplatin Regimen Chemotherapy for Stage III Gastric Carcinoma after Radical Resection
   Cheng Chen et al, 2021, Cancer Investigation CrossRef
9. Feasibility study of adjuvant chemotherapy with S-1 after curative esophagectomy following neoadjuvant chemotherapy for esophageal cancer
   Noriyuki Hirahara et al, 2022, BMC Cancer CrossRef
10. Completion of adjuvant S-1 chemotherapy after surgical resection for biliary tract cancer: A single center experience
    Kentaro Iwaki et al, 2023, Asian Journal of Surgery CrossRef