Abstract:
AIMS:S-1, an oral fluoropyrimidine, contains tegafur, which is converted to 5-fluorouracil mainly by CYP2A6. We evaluated the association between CYP2A6 polymorphisms and treatment outcome in metastatic gastric cancer patients treated with S-1 plus docetaxel. MATERIALS & METHODS:Chemonaive patients received S-1 40 mg/m(2) twice daily on days 1-14 and docetaxel 35 mg/m(2) on days 1 and 8 of a 3-week cycle. We analyzed the wild-type (W) allele (CYP2A6*1) and four variant (V) alleles that abolish or reduce enzyme activity (CYP2A6*4, *7, *9 and *10). A total of 50 patients were enrolled. RESULTS:The genotype frequencies were as follows: W/W (n=14, 28%), W/V (n=26, 52%) and V/V (n=0, 20%). Patients having fewer variant alleles had significantly better response rates (W/W vs W/V vs V/V=79 vs 65 vs 30%; p=0.04) and median progression-free survival (W/W vs W/V vs V/V=8.1 vs 6.9 vs 3.1 months; p=0.0009). CONCLUSION:Our findings showed that the CYP2A6 genotype correlated with the treatment efficacy of S-1-based chemotherapy in previously untreated metastatic gastric cancer patients.
journal_name
Pharmacogenomicsjournal_title
Pharmacogenomicsauthors
Kong SY,Lim HS,Nam BH,Kook MC,Kim YW,Ryu KW,Lee JH,Choi IJ,Lee JS,Park YI,Kim NK,Park SRdoi
10.2217/pgs.09.48subject
Has Abstractpub_date
2009-07-01 00:00:00pages
1147-55issue
7eissn
1462-2416issn
1744-8042journal_volume
10pub_type
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