alexa Bioequivalence Studies of A Generic Formulation (SW651K) to the Brand Drug S-1 in Tumor-Bearing Rat Models
ISSN: 0975-0851

Journal of Bioequivalence & Bioavailability
Open Access

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Research Article

Bioequivalence Studies of A Generic Formulation (SW651K) to the Brand Drug S-1 in Tumor-Bearing Rat Models

Tomoyuki Okabe1*, Takeharu Ogura1, Takashi Yoshimura1, Yoshiyuki Tanaka1, Hiromu Toyoda1, Ken-ichi Fujita2 and Yasutsuna Sasaki3

1Sawai Pharmaceutical Co., Ltd., Biological Research Department, 2-30 Miyahara 5-chome, Yodogawa-ku, Osaka, Japan

2Institute of Molecular Oncology, Showa University, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo, Japan

3Division of Medical Oncology, Department of Internal Medicine, Showa University School of Medicine, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo, Japan

*Corresponding Author:
Tomoyuki Okabe
Sawai Pharmaceutical Co., Ltd.
Biological Research Department
Tel: +81-6-6105-5731
Fax: +81-6-6394-7318
E-mail: [email protected]

Received Date: February 26, 2016; Accepted Date: March 04, 2016; Published Date: March 11, 2016

Citation: Okabe T, Ogura T, Yoshimura T, Tanaka Y, Toyoda H, et al. (2016) Bioequivalence Studies of A Generic Formulation (SW651K) to the Brand Drug S-1 in Tumor-Bearing Rat Models. J Bioequiv Availab 8: 112-117. doi: 10.4172/jbb.1000279

Copyright: © 2016 Okabe T, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.



SW651K, a fixed combination of tegafur (FT), 5-chloro-2,4-dihydroxypyridine (CDHP) and potassium oxonate (Oxo), is a generic preparation of S-1, which is widely used to treat gastric cancer in Japan. There is little detailed information of pharmacological effects of SW651K in clinical therapy. However it is not easy to evaluate the PK/PD in clinical trial. Therefore this study examined the bioequivalence of SW651K to S-1 in terms of pharmacokinetics and tumor shrinkage in tumor-bearing rats. Bioequivalence of SW651K to S-1 was first evaluated in Yoshida sarcomabearing rats. Concentrations of FT, 5-fluorouracil (5-FU, the active metabolite of FT), CDHP, and Oxo in plasma, tumor, small intestine, and large intestine were analyzed after a single dose of SW651K. Tumor size was measured during treatment with each formulation for 7 consecutive days. Next, tumor size was measured in human gastric cancer cell (NUGC4)-bearing rats treated for 14 days. Tumor 5-FU concentrations were also analyzed. Tumor size in NUGC4-bearing rats treated with SW651K or S-1 plus cisplatin was also evaluated. SW651K was bioequivalent to S-1 in terms of the pharmacokinetics of all components and of 5-FU in rats. Both formulations also had equivalent antitumor activities in Yoshida sarcoma- and NUGC4 tumor-bearing rats that received monotherapy. Moreover, combined treatment with cisplatin equally potentiated the antitumor effects of both formulations, without increasing body-weight loss in NUGC4 tumor-bearing rats. In conclusion, bioequivalence of SW651K and S-1 was confirmed in terms of pharmacokinetics and antitumor effectiveness in tumor-bearing rats. Our results suggest that SW651K is clinically equivalent to S-1.


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