Predictive value of VEGF gene polymorphisms for metastatic colorectal cancer patients receiving first-line treatment including fluorouracil, irinotecan, and bevacizumab

Vincenzo Formica, Raffaele Palmirotta, Girolamo Del Monte, Annalisa Savonarola, Giorgia Ludovici, Maria Laura De Marchis, Italia Grenga, Michele Schirru, Fiorella Guadagni, Mario Roselli

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Pages (from-to)143-151
Number of pages9
JournalInternational Journal of Colorectal Disease
Volume26
Issue number2
DOIs
Publication statusPublished - Feb 2011

Keywords

  • Bevacizumab
  • Metastatic colorectal cancer patients
  • Predictive markers
  • VEGF gene polymorphisms

ASJC Scopus subject areas

  • Gastroenterology

Fingerprint Dive into the research topics of 'Predictive value of VEGF gene polymorphisms for metastatic colorectal cancer patients receiving first-line treatment including fluorouracil, irinotecan, and bevacizumab'. Together they form a unique fingerprint.

Cite this