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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 

Mucinous colon carcinomas with microsatellite instability have a lower microvessel density and lower vascular endothelial growth factor expression.

We determined the association between cyclooxygenase-2 ( COX-2), vascular endothelial growth factor (VEGF) expression, microvessel density (MVD) and microsatellite instability (MSI) or the histological type in colon adenocarcinomas. Sixty-six cases were studied, 28 MSI+ and 38 MSI-. MSI phenotype was determined using polymerase chain reaction. MVD was assessed after CD31 staining in ten x400 fields (0.96 mm(2)) in the most vascularized areas. VEGF and COX-2 expression were studied by means of immunohistochemistry. MVD positively correlated with the levels of VEGF expression (P=10(-4)) and also with the levels of COX-2 expression (P=0.007). MVD and VEGF expression were lower in MSI+ carcinomas (P=0.002 and P=0.03 respectively). When mucinous tumors were excluded from the statistical analysis, the association between low MVD, low VEGF and MSI status disappeared (P=0.5, P=1, respectively). MSI+ mucinous carcinomas had a lower MVD and VEGF expression than other MSI+ carcinomas (P=0.008 and P=0.004, respectively) and MSI- mucinous carcinomas (P=0.01 and P=0.001, respectively). COX-2 expression was lower in medullary carcinomas (P=0.001). In conclusion, mucinous MSI+ colon carcinomas represent a special group of colon adenocarcinomas relating to angiogenesis, with a lower MVD and VEGF expression than both MSI- mucinous carcinomas and MSI+ non-mucinous carcinomas. A low COX-2 expression could be related to the medullary phenotype. However, this has to be confirmed in a larger series. Finally, the low MVD of MSI+ mucinous colon adenocarcinomas could participate in their overall better prognosis.[1]

References

  1. Mucinous colon carcinomas with microsatellite instability have a lower microvessel density and lower vascular endothelial growth factor expression. Wendum, D., Boëlle, P.Y., Rigau, V., Sebbagh, N., Olschwang, S., Mourra, N., Parc, R., Trugnan, G., Masliah, J., Fléjou, J.F. Virchows Arch. (2003) [Pubmed]
 
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