Caffeine test in predicting flutamide-induced hepatic injury in patients with prostate cancer

被引:13
作者
Ozono, S
Yamaguchi, A
Mochizuki, H
Kawakami, T
Fujimoto, K
Otani, T
Yoshida, K
Ichinei, M
Yamashita, T
Hirao, Y
机构
[1] Nara Med Univ, Dept Urol, Kashihara, Nara 6348522, Japan
[2] Nippon Kayaku Co Ltd, Tokyo 115, Japan
关键词
flutamide; hepatic injury; caffeine test; CYP1A2; activity;
D O I
10.1038/sj.pcan.4500564
中图分类号
R73 [肿瘤学];
学科分类号
100214 ;
摘要
The caffeine test measures the activity of cytochrome P450 (CYP1A2) which is a major enzyme involved in the activation of flutamide. The usefulness of this test in predicting flutamide-induced hepatic injury in patients with prostate cancer was examined. The subjects were: (1) five patients whose aspartate aminotransferase (AST) or alanine aminotransferase (ALT) level rose to 100 IU/l or higher following the start of flutamide (moderately injured group); (2) four patients whose AST and ALT levels were higher than normal but less than 100 IU/l (mildly injured group); and (3) two patients whose hepatic function remained normal (normal group). The subjects were each given canned coffee to drink. Urinary caffeine (137X), paraxanthine (17X) and 1, 7-dimethyluric acid (17U) levels were measured 4 - 5 h later. The metabolite ratio, (17U + 17X)/137X, was calculated to serve as an indicator of CYP1A2 activity. The metabolite ratio for the moderately injured group (3.98 +/- 1.56) and the mildly injured group (5.55 +/- 1.42) were lower than that for the normal group (9.56). The results suggest that a decrease in CYP1A2 activity is involved in the onset of flutamide-induced hepatic injury, and that the caffeine test seems to provide a useful means of its prediction.
引用
收藏
页码:128 / 131
页数:4
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