4.7 Article

Identification of serum angiopoietin-2 as a biomarker for clinical outcome of colorectal cancer patients treated with bevacizumab-containing therapy

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BRITISH JOURNAL OF CANCER
卷 103, 期 9, 页码 1407-1414

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SPRINGERNATURE
DOI: 10.1038/sj.bjc.6605925

关键词

colorectal cancer; angiopoietin-2; biomarker; chemotherapy; bevacizumab

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资金

  1. Centre of Molecular Medicine Cologne (CMMC)
  2. Moritz-Stiftung the Hilde-Kopp-Stiftung (Cologne)
  3. Marga and Walter Boll Stiftung (Kerpen)

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BACKGROUND: The combination of chemotherapy with the vascular endothelial growth factor (VEGF) antibody bevacizumab is a standard of care in advanced colorectal cancer (CRC). However, biomarkers predicting outcome of bevacizumab-containing treatment are lacking. As angiopoietin-2 (Ang-2) is a key regulator of vascular remodelling in concert with VEGF, we investigated its role as a biomarker in metastatic CRC. METHODS: Serum Ang-2 levels were measured in 33 healthy volunteers and 90 patients with CRC. Of these, 34 had metastatic disease and received bevacizumab-containing therapy. To determine the tissue of origin of Ang-2, quantitative real-time PCR was performed on microdissected cryosections of human CRC and in a murine xenograft model of CRC using species-specific amplification. RESULTS: Ang-2 originated from the stromal compartment of CRC tissues. Serum Ang-2 levels were significantly elevated in patients with metastatic CRC compared with healthy controls. Amongst patients receiving bevacizumab-containing treatment, low pre-therapeutic serum Ang-2 levels were associated with a significant better response rate (82 vs 31%; P<0.01), a prolonged median progression-free survival (14.1 vs 8.5 months; P<0.01) and a reduction of 91% in the hazard of death (P<0.05). CONCLUSION: Serum Ang-2 is a candidate biomarker for outcome of patients with metastatic CRC treated with bevacizumab-containing therapy, and it should be further validated to customise combined chemotherapeutic and anti-angiogenic treatment. British Journal of Cancer (2010) 103, 1407-1414. doi: 10.1038/sj.bjc.6605925 www.bjcancer.com Published online 5 October 2010 (C) 2010 Cancer Research UK

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