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Pronounced differences between native Chinese and Swedish populations in the polymorphic hydroxylations of debrisoquin and S‐mephenytoin
Author(s) -
Bertilsson Leif,
Lou YaQing,
Du YunLong,
Liu Yin,
Kuang TangYun,
Liao XiaMau,
Wang KeYi,
Reviriego Jesús,
Iselius Lennart,
Sjöqvist Folke
Publication year - 1992
Publication title -
clinical pharmacology and therapeutics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.941
H-Index - 188
eISSN - 1532-6535
pISSN - 0009-9236
DOI - 10.1038/clpt.1992.38
Subject(s) - mephenytoin , biology , pharmacogenetics , dose , medicine , pharmacology , genetics , genotype , gene
The frequency of poor metabolizers of debrisoquin was low and similar in four different native Chinese nationalities. In a total sample of 695 Chinese subjects, only seven (1.01%) had a urinary ratio between debrisoquin and 4‐hydroxydebrisoquin >12.6, which is the antimode between poor metabolizers and extensive metabolizers in white populations. This is significantly lower than the 6.82% found in 1011 white Swedish healthy subjects ( p < 0.0001). Admixture analysis indicated the occurrence of two distributions within extensive metabolizers among both Chinese and white subjects. The mean of the distribution of metabolic ratios among Chinese extensive metabolizers was shifted toward higher values compared with Swedish extensive metabolizers ( p < 0.01). The frequency of poor metabolizers of S‐mephenytoin was higher in 137 Chinese (14.6%) than in 488 Swedish (3.3%) subjects ( p < 0.0001). Our findings imply that drugs metabolized by these two polymorphic hydroxylases should be prescribed in different dosages to Chinese and white subjects. Clinical Pharmacology and Therapeutics (1992) 51, 388–397; doi: 10.1038/clpt.1992.38