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Orally administered S-1 suppresses circulating endothelial cell counts in metastatic breast cancer patients

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Abstract

Background

S-1 is an oral cytotoxic preparation that contains tegafur. Gamma-butyrolactone (GBL) is a metabolite of tegafur that is known to suppress vascular endothelial growth factor (VEGF)-mediated angiogenic activity. The aim of this study was to determine the change in circulating endothelial cell (CEC) counts, GBL levels, and angiogenesis-related factors during S-1 administration in metastatic breast cancer (MBC) patients.

Methods

Patients with HER2-negative MBC were eligible. S-1 was administered orally twice daily in a 4 week on/2 week off cycle until disease progression or unacceptable toxicity occurred. Blood was collected on the following: days 1, 43, 85 (before each cycle of S-1 administration), days 15, 57 (1 h after S-1 administration), and day 29. The CellSearch® system was used to count the CECs. The gas chromatographic–mass spectrometric method was used to measure plasma GBL and 5-FU levels. Levels of VEGF were assayed by enzyme-linked immunosorbent assay.

Results

A total of 18 patients were enrolled. The plasma GBL levels on days 15 and 57 were 41.3 ± 15.8 and 41.0 ± 11.2 ng/mL, respectively. The CEC levels decreased on day 15, and significantly low levels were maintained until day 85 (P = 0.002 vs day 1). The plasma VEGF levels significantly decreased on day 15 (P = 0.012 vs day 1) and had a tendency to decrease until day 57.

Conclusions

This exploratory study showed that GBL levels increased, VEGF levels decreased, and CEC levels were suppressed during S-1 administration. S-1 appears to have anti-angiogenic activity.

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Acknowledgments

We express our gratitude to the patients who participated in this exploratory trial. We thank Dr. Yasufumi Teramura (Hikone Municipal Hospital, Shiga), Dr. Satoru Nishimura, and Dr. Yasuo Matsutani (Tenri Hospital, Nara) for providing data support. We also thank Ms. Masako Ishida for her excellent clinical research assistance. We appreciate Dr. Teiji Takechi (Taiho Pharmaceutical Co. Ltd., Tokyo) for his critical review of the manuscript. This study was supported by Taiho Pharmaceutical Co. Ltd.

Conflict of interest

Wakako Tsuji was an employee of Kyoto University’s Sponsored Research Program funded by Taiho Pharmaceutical Co., Ltd.; Masakazu Toi received honoraria and research funding from Taiho Pharmaceutical Co., Ltd.; Hiroshi Ishiguro received honoraria and research funding from Taiho Pharmaceutical Co., Ltd.; Takayuki Ueno, Sunao Tanaka, and Megumi Takeuchi have no conflict of interest.

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Correspondence to Wakako Tsuji.

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Tsuji, W., Ishiguro, H., Tanaka, S. et al. Orally administered S-1 suppresses circulating endothelial cell counts in metastatic breast cancer patients. Int J Clin Oncol 19, 452–459 (2014). https://doi.org/10.1007/s10147-013-0570-5

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  • DOI: https://doi.org/10.1007/s10147-013-0570-5

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