Gastric Cancer

, Volume 6, Supplement 1, pp 13–18 | Cite as

Experimental study to evaluate the usefulness of S-1 in a model of peritoneal dissemination of gastric cancer

  • Takuji Mori
  • Yoshiyuki Fujiwara
  • Masahiko Yano
  • Shigeyuki Tamura
  • Takushi Yasuda
  • Shuji Takiguchi
  • Morito Monden



Favorable results have been reported for the novel oral anticancer agent S-1 (TS-1®) in clinical studies of advanced gastric cancer with peritoneal dissemination. In the present study we assessed its pharmacokinetics, inhibitory effects, and effect on survival time in an animal model.


A model of peritoneal dissemination was created by intraperitoneally implanting 4-week-old female BALBc nu/nu mice with the human gastric cancer cell line MKN-45 after transfection with a fluorescent protein-expressing vector. Pharmacokinetics were investigated by measuring intratumor, peritoneal lining, and blood concentrations after the administration of S-1 and fluorouracil (5-FU). The effect of S-1 on survival time was also assessed, by administration once daily to seven animals per group, starting on day 7 after implantation, and survival time was compared with that of an untreated control group. The inhibitory effect of S-1 on peritoneal dissemination was evaluated by killing mice at the start of administration, and 1 and 3 weeks after the start of administration, and examining them for the presence of peritoneal dissemination under a fluorescence stereomicroscope.


Maintenance of high 5-FU concentrations in the intraperitoneal tumors was confirmed in the S-1 group, and survival time was prolonged without any decrease in oral food intake or body weight.


Assessment in a model of peritoneal dissemination of gastric cancer showed that the novel oral anticancer agent S-1 was effective against peritoneal dissemination, and that it improved the survival rate.

Key words

Gastric cancer Peritoneal dissemination S-1 


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Copyright information

© International and Japanese Gastric Cancer Associations 2003

Authors and Affiliations

  • Takuji Mori
    • 1
  • Yoshiyuki Fujiwara
    • 1
  • Masahiko Yano
    • 1
  • Shigeyuki Tamura
    • 1
  • Takushi Yasuda
    • 1
  • Shuji Takiguchi
    • 1
  • Morito Monden
    • 1
  1. 1.Department of Surgery and Clinical Oncology, Graduate School of MedicineOsaka UniversityOsakaJapan

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