| Autor: |
Parmar, Sumit, Stingl, Julia Carolin, Huber-Wechselberger, Ariana, Kainz, Alexander, Renner, Wilfried, Langsenlehner, Uwe, Krippl, Peter, Brockmöller, Jürgen, Haschke-Becher, Elisabeth |
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| Zdroj: |
Breast Cancer Research; 2011, Vol. 13 Issue 3, p1-8, 8p, 1 Diagram, 3 Charts, 2 Graphs |
| Abstrakt: |
Introduction: Epirubicin is a common adjuvant treatment for breast cancer. It is mainly eliminated after glucuronidation through uridine diphosphate-glucuronosyltransferase 2B7 (UGT2B7). The present study aimed to describe the impact of the UGT2B7His268Tyr polymorphism on invasive disease-free survival in breast cancer patients after epirubicin treatment. Methods: This is a pharmacogenetic study based on samples collected from 745 breast cancer patients of the Austrian Tumor of breast tissue: Incidence, Genetics, and Environmental Risk factors (TIGER) cohort who did not present metastases at baseline. This cohort included 205 women with epirubicin-based combination chemotherapy, 113 patients having received chemotherapy without epirubicin and 427 patients having received no chemotherapy at all. Of the epirubicin-treated subgroup, 120 were subsequently treated with tamoxifen. For all women UGT2B7His268Tyr was genotyped. Invasive disease-free survival was assessed using Kaplan-Meier and Cox's proportional hazard regression analysis. Results: Among the 205 epirubicin-treated patients, carriers of two UGT2B7268Tyr alleles had a mean invasive disease-free survival of 8.6 (95% confidence interval (CI) 7.9 to 9.3) years as compared to 7.5 (95% CI 6.9 to 8.0) years in carriers of at least one UGT2B7268His allele (adjusted hazard ratio (HR) = 2.64 (95% CI 1.22 to 5.71); P = 0.014). In addition, the impact of the UGT2B7His268Tyr polymorphism became even more pronounced in patients subsequently treated with tamoxifen (adjusted HR = 5.22 (95% CI 1.67 to 26.04); P = 0.015) whereas no such difference in invasive disease-free survival was observed in patients not receiving epirubicin. Conclusions: Breast cancer patients carrying the UGT2B7268Tyr/Tyr genotype may benefit most from adjuvant epirubicin-based chemotherapy. These results warrant confirmation in further studies. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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