1. Surgery alone, adjuvant tegafur/gimeracil/octeracil (S-1), or platinum-based chemotherapies for resectable gastric cancer: real-world experience and a propensity score matching analysis
   Chih-Chieh Yen et al, 2021, BMC Cancer 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, Japanese Journal of Clinical Oncology 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, 2020, Lung Cancer CrossRef
4. 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, Frontiers in Oncology CrossRef
5. 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
6. 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, 2022, Cancer Investigation CrossRef
7. Comparison of 2- and 4-week S-1 administration as adjuvant chemotherapy for advanced gastric cancer
   Koichi Ogawa et al, 2020, International Journal of Clinical Oncology CrossRef
8. 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
9. Planned drug holidays during treatment with lenvatinib for radioiodine-refractory differentiated thyroid cancer: a retrospective study
   Chihiro Matsuyama et al, 2023, Frontiers in Oncology CrossRef
10. 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
11. Completion of adjuvant S-1 chemotherapy after surgical resection for biliary tract cancer: A single center experience
    Kentaro Iwaki et al, 2024, Asian Journal of Surgery CrossRef
12. Phase 2 Trial of Adjuvant Chemotherapy With S − 1 for Node-Positive Biliary Tract Cancer (N-SOG 09)
    Kazuaki Seita et al, 2020, Annals of Surgical Oncology CrossRef