Erschienen in:
01.02.2011 | Original Article
Predictive value of VEGF gene polymorphisms for metastatic colorectal cancer patients receiving first-line treatment including fluorouracil, irinotecan, and bevacizumab
verfasst von:
Vincenzo Formica, Raffaele Palmirotta, Girolamo Del Monte, Annalisa Savonarola, Giorgia Ludovici, Maria Laura De Marchis, Italia Grenga, Michele Schirru, Fiorella Guadagni, Mario Roselli
Erschienen in:
International Journal of Colorectal Disease
|
Ausgabe 2/2011
Einloggen, um Zugang zu erhalten
Abstract
Purpose
The aim of this study is to evaluate the influence of germline vascular endothelial growth factor (VEGF) gene polymorphisms (VGPs) on the efficacy of the anti-VEGF antibody bevacizumab (Bev) in metastatic colorectal cancer (MCRC) patients.
Methods
Forty MCRC patients eligible for a first-line therapy were enrolled in this prospective trial and treated with FOLinate/Fluorouracil/Irinotecan (FOLFIRI) + Bev (male/female = 22:18, age (median) = 61 years). Eight VGPs within the promoter/5’UTR region were evaluated in patient blood samples. Primary endpoint was association between VGPs and median progression-free survival (mPFS). Overall radiological response rate (ORR), overall survival (OS), and toxicity were assessed as secondary outcomes.
Results
VGPs −2578, −1512, −1451, −1411, and −460 were in complete linkage disequilibrium and therefore analyzed as haplotype (two variants: Haplo1: A-18 bp insertion-T-4G-C and Haplo2: C-18 bp deletion-C-5G-T, respectively). Seventeen patients Haplo2/Haplo2 had significantly shorter mPFS compared to 23 patients Haplo1/Haplo1 or Haplo1/Haplo2 (mPFS, 9 vs. 15.4 months, respectively, p = 0.02; hazard ratio (HR), 2.64). Also, VGPs −152 (G/G vs. G/A + A/A) and −1154 (G/G vs. G/A + A/A) were significantly associated with PFS (mPFS, 8.9 vs. 15.4 months, p = 0.007; HR, 3.53 and 9.8 vs. 16 months, p = 0.03, HR, 2.32, respectively). In the multivariate analysis including also biochemical variables known to influence prognosis, VGP −1154 retained an independent predictive value for mPFS (G/G over G/A + A/A = HR, 4.43; p = 0.02). With regard to ORR, only VGP −634 was significantly associated with response (G/G vs. G/C + C/C = 64% vs. 14%, p = 0.03). No significant influence on OS and toxicity by the investigated VGPs was observed.
Conclusions
Although these data need to be confirmed in larger trials, investigation of germline VGPs may help identify patients who are more sensitive to anti-VEGF agents.