Open AccessInfluence of ABCB1 and ABCG2 polymorphisms on doxorubicin disposition in Asian breast cancer patients
Author(s) -
Lal Suman,
Wong Zee Wan,
Sandanaraj Edwin,
Xiang Xiaoqiang,
Ang Peter Cher Siang,
Lee Edmund J. D.,
Chowbay Balram
Publication year - 2008
Publication title -
cancer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.035
H-Index - 141
eISSN - 1349-7006
pISSN - 1347-9032
DOI - 10.1111/j.1349-7006.2008.00744.x
Subject(s) - doxorubicin , genotype , breast cancer , medicine , allele , pharmacokinetics , allele frequency , abcg2 , pharmacology , gastroenterology , chemotherapy , cancer , biology , gene , genetics , atp binding cassette transporter , transporter
The influence of three high frequency ABCB1 polymorphisms (c. 1236C>T , c. 2677G>A/T , and c. 3435C>T ) and the ABCG2 c. 421C>A polymorphism on the disposition of doxorubicin in Asian breast cancer patients receiving adjuvant chemotherapy was investigated in the present study. The allelic frequency of the ABCB1 c. 1236T , c. 2677T , c. 2677A , and c. 3435T variants were 60%, 38%, 7%, and 22%, respectively, and the frequency of the ABCG2 c. 421A allele was 23%. Pairwise analysis showed increased exposure levels to doxorubicin in patients harboring at least one ABCB1 c. 1236T allele ( P = 0.03). Patients homozygous for the CC‐GG‐CC genotype had significantly lower doxorubicin exposure levels compared to the patients who had CT‐GT‐CT ( P = 0.02) and TT‐TT‐TT genotypes ( P = 0.03). Significantly increased clearance of doxorubicin was also observed in patients harboring CC‐GG‐CC genotypes when compared to patients harboring the CT‐GT‐CT genotype ( P = 0.01). Patients harboring the CC‐GG‐CC genotypes had significantly lower peak plasma concentrations of doxorubicinol compared to patients who had TT‐TT‐TT genotypes ( P = 0.03). No significant influences on doxorubicin pharmacokinetic parameters were observed in relation to the ABCG2 c .421C>A polymorphism. In conclusion, the present exploratory study suggests that the three high frequency linked polymorphisms in the ABCB1 gene might be functionally important with regards to the altered pharmacokinetics of doxorubicin in Asian breast cancer patients, resulting in significantly increased exposure levels and reduced clearance. ( Cancer Sci 2008; 99: 816–823)