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Japanese Journal of Clinical Oncology Advance Access published online on July 8, 2005
Japanese Journal of Clinical Oncology, doi:10.1093/jjco/hyi122
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© 2005 Foundation for Promotion of Cancer Research
Received January 6, 2005
Accepted March 8, 2005

Case Report

Drug Interaction Between Gefitinib and Warfarin

Sayaka Onoda 1, Hisashi Mitsufuji 1*, Nobuo Yanase 1, Shinichiro Ryuge 1, Emi Kato 1, Mayumi Wada 1, Kaori Ishii 1, Shintaro Hagiri 1, Michiko Yamamoto 1, Masanori Yokoba 1, Tomoko Yanaihara 1, Masaru Kuboto 1, Nobukazu Takada 1, Masato Katagiri 1, Tadashi Abe 1, Naohiko Tanaka 1, Hirosuke Kobayashi 1, and Noriyuki Masuda 1

1 Department of Respiratory Medicine, Kitasato University School of Medicine, Sagamihara, Kanagawa, Japan

* To whom correspondence should be addressed.
Hisashi Mitsufuji, E-mail: kokyuki{at}kitasato-u.ac.jp


  Abstract

Gefitinib is a synthetic, oral anilinoquinazoline specifically designed to inhibit the epidermal growth factor receptor tyrosine kinase, and is the first targeted drug to demonstrate reproducible activity in non-small cell lung cancer patients who do not respond to platinum-based chemotherapy. In this report, we present two cases of an interaction between gefitinib and warfarin which has not been reported previously. Because of the potentially serious consequences of this interaction, close monitoring of the International Normalized Ratio and warfarin dosage adjustment are recommended for patients receiving warfarin together with gefitinib.

Keywords: gefitinib; warfarin; drug interaction; International Normalized Ratio; non-small cell lung cancer.
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[Abstract] [Full Text] [PDF]


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