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Poster Display session 2

2117 - The relationship between the survival and fixed dosing of S-1 in advanced gastric cancer patients by pooled analysis using individual data from four Japanese randomized phase III trials


29 Sep 2019


Poster Display session 2


Wataru Ichikawa


Annals of Oncology (2019) 30 (suppl_5): v253-v324. 10.1093/annonc/mdz247


W. Ichikawa1, M. Takeuchi2, Y. Sunakawa3, K. Shitara4, K. Oba5, Y. Yamada6, W. Koizumi7, Y. Sakata8, H. Furukawa9, M. Takeuchi10, M. Fujii11

Author affiliations

  • 1 Department Of Medical Oncology, Showa University Fujigaoka Hospital, 227-8501 - Yokohama/JP
  • 2 Faculty Of Environment And Information Studies, Keio University, 252-0882 - Fujisawa/JP
  • 3 Clinical Oncology Department, St.Marianna University School of Medicine, 216-8511 - Sagamihara/JP
  • 4 Department Of Gastrointestinal Oncology, National Cancer Center Hospital East Kashiwa City, 277-8577 - Chiba/JP
  • 5 Department Of Biostatistics, School Of Public Health, Graduate School Of Medicine, The University of Tokyo, 113-0033 - Tokyo/JP
  • 6 Dept. Of Medical Oncology, Hamamatsu University School of Medicine, 431-3192 - Hamamatsu/JP
  • 7 Department Of Gastroenterology, Kitasato University School of Medicine, 252-0374 - Kanagawa/JP
  • 8 Ceo, Misawa City Hospital, 033-0022 - Misawa/JP
  • 9 Department Of Sugery, Kindai University Faculty of Medicine, 589-8511 - Osaka-sayama/JP
  • 10 Department Of Clinical Medicine (biostatics), Kitasato University, 108-8641 - Tokyo/JP
  • 11 Digestive Surgery, Nihon University School of Dentistry Medecine, 101-8309 - Tokyo/JP


Abstract 2117


S-1 is a commonly used agent in first line therapy of advanced gastric cancer in Japan. The recommended initial dose of S-1 is 120 mg/day for patients (pts) with a body surface area (BSA) of ≥ 1.5 m2 in Japan. Systemic exposure to 5-FU is significantly lower in Japanese cancer pts with a large BSA of ≥ 1.75 m2 who received the recommended fixed dose of S-1, as compared with those with a BSA of ≥ 1.50 m2 and <1.75 m2 (Ann Oncol 20: 946-949, 2009). However, there has been little knowledge of the relationship between survival and fixed dosing of S-1 in pts with large BSA.


Actual data from four randomized Japanese Phase III trials [START (S-1 vs S-1/docetaxel), SPIRITS (S-1 vs S-1/cisplatin), GC0301/TOP-002 (S-1 vs S-1/irinotecan), G-SOX (S-1+cisplatin vs S-1/oxaliplatin)] were combined to evaluate the effect of BSA on survival (OS) in terms of S-1 monotherapy and S-1 combination therapy. The pts were divided into two categories: those with BSA of ≥ 1.50 m2 and <1.75 m2 and those with a BSA of ≥ 1.75m2. The prognostic relevance of BSA was assessed using a multivariate proportional hazards model adjusted for the established clinical prognostic factors including age, performance status, tumor status, primary tumor, hematogenous metastasis, and peritoneal metastasis.


A total of 1,246 pts were available in this analysis (S-1 monotherapy, n = 395; S-1 combination therapy, n = 851). The median OS for S-1 monotherapy and S-1 combination therapy was 11.7 and 13.6 months, respectively. In pts treated with S-1 monotherapy, OS was significantly shorter in those with a BSA of ≥ 1.75 m2, compared with those with a BSA of ≥ 1.5 m2 and <1.75m2 (HR 1.39; 95% CI 1.05-1.84; p = 0.02). However, OS was comparable in the two BSA categories for pts treated with S-1 combination (HR 1.09; 95% CI 0.90-1.34; p = 0.349). BSA was an independent prognostic factor in S-1 monotherapy (HR 1.33; 95% CI 0.999-1.77; p = 0.05) but not in S-1 combination therapy (HR 1.05; 95% CI 0.85-1.29; p = 0.65).


Although the fixed dosing of S-1 monotherapy affects the survival in pts with large BSA, combination therapy might overcome the worse prognosis even in those with large BSA.

Clinical trial identification


Editorial acknowledgement

Legal entity responsible for the study

Japan Clinical Cancer Research Organization.


Has not received any funding.


W. Ichikawa: Honoraria (self), Research grant / Funding (institution): Taiho Pharmaceutical Co. Ltd.; Honoraria (self), Research grant / Funding (institution): Chugai Pharmaceutical Co. Ltd.; Honoraria (institution): Takeda Pharmaceutical Co.; Honoraria (self), Research grant / Funding (institution): Merck Serono; Honoraria (self): Bayer Yakuhin Ltd.; Research grant / Funding (institution): Ono Pharmaceutical Co. Ltd.; Research grant / Funding (institution): Shionogi Pharmaceutical Co. Ltd. Y. Sunakawa: Honoraria (self): Bristol-Myers Squibb; Honoraria (self), Honoraria (institution): Taiho Pharmaceutical Co. Ltd; Honoraria (self), Research grant / Funding (institution): Chugai Pharmaceutical Co. Ltd.; Honoraria (self), Research grant / Funding (institution): Yakult Honsha Co. Ltd.; Honoraria (self), Advisory / Consultancy, Research grant / Funding (institution): Takeda Pharmaceutical Co. Ltd.; Honoraria (self), Research grant / Funding (institution): Merck Serono; Honoraria (self): Bayer Yakuhin Ltd; Honoraria (self), Research grant / Funding (institution): Sanofi K.K.; Honoraria (self), Research grant / Funding (institution): Eli Lilly Japan; Research grant / Funding (institution): Daiichi Sankyo Pharmaceutical Co. Ltd.; Research grant / Funding (institution): MSD K.K.; Research grant / Funding (institution): Dainippon Sumitomo Pharmaceutical Co. Ltd.; Research grant / Funding (institution): Solasia Pharma K.K. K. Shitara: Honoraria (self): Novartis; Honoraria (self): AbbVie; Honoraria (self): Yakult; Honoraria (institution), Advisory / Consultancy: Astellas Pharma; Honoraria (institution), Advisory / Consultancy: Lilly; Advisory / Consultancy: Bristol-Myers Squibb; Advisory / Consultancy: Takeda; Advisory / Consultancy: Pfizer; Honoraria (institution), Advisory / Consultancy: Ono Pharmaceutical; Honoraria (institution), Advisory / Consultancy: MSD; Honoraria (institution): Dainippon Sumitomo Pharma; Honoraria (institution): Daiichi Sankyo; Honoraria (institution): Taiho Pharmaceutical; Honoraria (institution): Chugai Pharma; Honoraria (institution): Medi Science. K. Oba: Honoraria (self): Eisai Co., Ltd.; Honoraria (self): Chugai Pharmaceutical Co., Ltd.; Honoraria (self): Daiichi-Sankyo Pharmaceutical Co., Ltd.; Honoraria (self): Asahi Kasei Pharma Corp.; Advisory / Consultancy: Takeda Pharmaceuticals, Co., Ltd.; Advisory / Consultancy: Ono Pharmaceutical Co., Ltd. Y. Yamada: Honoraria (self): Taiho Pharmaceutical Co. Ltd.; Honoraria (self): Chugai Pharmaceutical Co. Ltd.; Honoraria (self): Nippon Kayaku; Honoraria (self): Eli Lilly; Honoraria (self): Ono Pharmaceutical Co. Ltd.; Honoraria (self): Bristol-Myers Squibb; Research grant / Funding (institution): Daiichi-Sankyo. Y. Sakata: Honoraria (self): Taiho Pharmaceutical Co. Ltd.; Advisory / Consultancy: Yakult Honsha. M. Takeuchi: Advisory / Consultancy: Hisamitsu Pharmaceutical; Advisory / Consultancy: Kowa; Advisory / Consultancy: Shionogi; Advisory / Consultancy: AbbVie. M. Fujii: Travel / Accommodation / Expenses: Taiho Pharmaceutical Co. Ltd.; Travel / Accommodation / Expenses: Japan Clinical Cancer Research Organization. All other authors have declared no conflicts of interest.

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