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Previous studies indicate that the variant status of detoxification proteins is different
among Taiwanese and other ethnic groups. For example, in Taiwanese, the major SNPs of CYP2C9
are CYP2C9*2 (430C>T) and CYP2C9*3 (1075A>C) and their frequencies are different from that
in Caucasians . The second example is that the frequency of the A(TA)7TAA allele in the
promoter area of the UGT1A1 gene is substantially lower, while for the rate of variation
within the coding region is much higher in Taiwanese than that in Caucasians (14.3% vs.
35.7- 41.5% and 29.3% vs. 0.1%, respectively) . The third example is that the frequency
of 388A>G of the OATP2 gene in Taiwanese (0.68)  is in between that in European
Americans (0.30) and African Americans (0.74) . Therefore, the investigators hypothesize
that, in Taiwanese the SNPs of detoxification proteins modulate the lipid-lowing effects of
RVA and fenofibrate may be different from those for Caucasians.