Abstract
Background
S-1 is the most effective oral fluoropyrimidine derivative widely used for patients with gastric carcinoma in Japan. Although S-1 plus taxane has been a promising candidate as an effective chemotherapeutic regimen, the mechanisms of its additive or synergistic anticancer effects and changes in gene expression after the administration of these agents have not yet been fully elucidated.
Methods
Experimental chemotherapy was performed using human gastric carcinoma xenografts, MKN-45 and TMK-1, to examine anticancer effects and gene expressions of fluoropyrimidine metabolism-related enzymes including thymidine phosphorylase (TP), thymidylate synthase (TS), dihydropyrimidine dehydrogenase (DPD), orotate phosphoribosyltransferase (OPRT), and uridine phosphorylase (UP). Nude mice were treated with S-1, paclitaxel, and their combination. After treatment, in vivo antitumor effects of S-1, paclitaxel alone, and their combination and the effects on gene expressions of enzymes involved in 5-fluorouracil metabolism were examined using the RT-PCR method.
Results
The combined use of S-1 and paclitaxel showed additive to synergistic antitumor effects on both gastric cancer xenografts. While consistent upregulation of dThPase and DPD gene expression was exhibited after administration of S-1, no further increase of dThPase gene expression after combined use of S-1 with paclitaxel was observed. There was no increase in TS gene expression after the administration of either S-1 alone or paclitaxel alone.
Conclusion
These results provide some insight into the mechanism and/or rationale underlying the additive to synergistic effect of combined administration of S-1 and paclitaxel in gastric carcinoma.
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Acknowledgements
This study was supported in part by grants from Ministry of Health, Labor and Welfare (#14571242) and from Fujita Health University. The authors thank Miss Akemi Someya for an excellent technical assistance for performing the animal experiments.
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Sakurai, Y., Yoshida, I., Kamoshida, S. et al. Effects of Combined Administration of DPD-Inhibitory Oral Fluoropyrimidine, S-1, Plus Paclitaxel on Gene Expressions of Fluoropyrimidine Metabolism-Related Enzymes in Human Gastric Xenografts. Ann Surg Oncol 15, 2301–2309 (2008). https://doi.org/10.1245/s10434-008-9963-5
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DOI: https://doi.org/10.1245/s10434-008-9963-5