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Digital image analysis and stereology of angiogenesis in polypoid and nonpolypoid colorectal adenomas
Cláudio Tarta1, Vinícius Duval da Silva, Cláudio Rolim Teixeira
1Department of Surgery, Federal University of Rio Grande do Sul, Brazil. tarta.ez@terra.com.br
Objective:
To evaluate 3-dimensional parameters and bidimensional microvascular quantification in the different morphologic presentations of colorectal adenomas.
Study Design:
A study was carried out, including 102 neoplastic colorectal lesions obtained by endoscopy or surgical resection. For the analysis of angiogenesis, immunohistochemistry, digital image analysis, microvascular quantification and stereology were used.
Results:
Microvascular quantification, volume and microvascular length estimate rose gradually with high grade dysplasia as compared to the low grade ones (P < .001). There was no significant difference in angiogenesis between polypoid and nonpolypoid colorectal adenomas in terms of quantification and microvascular length estimate.
Conclusion:
The use of digital image analysis and stereology added greater objectivity and effectiveness to angiogenic evaluation because they allowed accurate segmentation of hypervascular areas, representation of the characteristic 3-dimensional morphology of the vascular supply and identification of differences in microvascularization in the developmental stages of colorectal cancer. However, no significant relation could be found between macroscopic type and angiogenesis, suggesting that angiogenesis may contribute little to morphogenesis of colorectal adenomas.