Role of VEGFA gene polymorphisms in colorectal cancer patients who treated with bevacizumab
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Wei Cui1, Feng Li2, Qiang Yuan1, Gang Chen1, Cailing Chen1 and Bo Yu1
1Department of General Surgery, The Military General Hospital of Beijing PLA, Beijing 100700, China
2Department of Health, The Military General Hospital of Beijing PLA, Beijing 100700, China
Bo Yu, email: email@example.com
Keywords: VEGFA; polymorphisms; bevacizumab; colorectal cancer
Received: March 21, 2017 Accepted: August 26, 2017 Published: November 06, 2017
Objectives: This study aimed to explore the effects of vascular endothelial growth factor A (VEGFA) gene polymorphisms (rs699947 and rs833061) on Bevacizumab (BEV) treatment in colorectal cancer (CRC) patients.
Methods: 125 CRC cases receiving BEV plus FOLFIRI treatment were recruited in this study. VEGFA polymorphisms were genotyped using polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) method. Correlation of VEGFA gene polymorphisms with the response rate and progression free survival (PFS) was evaluated. Multivariate analyses were performed to estimate the effects of VEGFA polymorphisms on the therapeutic effects of BEV treatment in CRC patients.
Results: Rs699947 variants did not show significant association with BEV treatment. For rs833061 analysis, TT and TC genotype carriers had significantly higher ORR (objective response rate) than CC carriers (P=0.048 and P=0.021, respectively). Moreover, TT carriers underwent a well DCR (disease control rate) compared to CC carriers (P=0.002). PFS time also showed obvious correlation with rs833061 polymorphism (log rank test, P=0.002). Multivariate analyses demonstrated that TT and TC genotypes of rs833061 polymorphism were significantly correlated with enhanced therapeutic effects and prolonged PFS in CRC patients.
Conclusion: VEGFA rs833061 polymorphism is significantly associated with the therapeutic efficiency of bevacizumab in CRC patients.
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