Erschienen in:
01.10.2014 | Original Article
Pharmacogenetics of adjuvant breast cancer treatment with cyclophosphamide, epirubicin and 5-fluorouracil
verfasst von:
David Jamieson, Jo Lee, Nicola Cresti, Rosanna Jackson, Melanie Griffin, Julieanne Sludden, Mark Verrill, Alan V. Boddy
Erschienen in:
Cancer Chemotherapy and Pharmacology
|
Ausgabe 4/2014
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Abstract
Purpose
Most adjuvant breast cancer treatment regimens include the combination of an anthracycline (epirubicin or doxorubicin) and the alkylating agent cyclophosphamide. This study sought to investigate the influence of pharmacogenetics on the pharmacokinetics and metabolism of these agents.
Methods
Blood samples were taken from patients treated with cyclophosphamide (n = 51) and epirubicin (n = 35), with or without 5-fluorouracil (5-FU). The pharmacokinetics and metabolism of the three drugs were investigated, together with pharmacogenetic investigations for cyclophosphamide and epirubicin. Cyclophosphamide and its metabolites and also epirubicin and epirubicinol were measured in plasma. DNA was extracted from whole blood and genotyping performed using RT-PCR.
Results
Patients with at least one variant CYP2C19*17 allele had a longer CP half-life (p = 0.007), as did homozygous variants for the CYP2B6*6 allele. There was no significant effect of GSTP1, CYP2B6*2, CYP2B6*5 or CYP2C19*2 on any pharmacokinetic parameter of CP. An NQO2 exonic SNP was associated with a higher exposure to epirubicinol relative to epirubicin (p = 0.011). Other polymorphic variants of NQO1, carbonyl reductase, UGT enzymes and transporters had no influence on epirubicin or its metabolite.
Conclusion
Overall, pharmacogenetic factors had only a minor influence on cyclophosphamide or anthracycline-based adjuvant therapy of breast cancer.