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Heterogeneity in microvascular density in lung tumours: comparison with normal bronchus
A M Schor1, S Pazouki, J Morris
1Cell and Molecular Biology Unit, Dental School, University of Dundee, UK.
British Journal of Cancer
|April 7, 1998
Summary
Microvascular density (MVD) in lung cancer may not accurately reflect angiogenesis. Measuring MVD in a single tissue block risks misrepresenting the tumor's overall vascularity, potentially leading to inaccurate conclusions.
Area of Science:
- Oncology
- Pathology
- Angiogenesis Research
Background:
- Microvascular density (MVD) is often used as a surrogate marker for angiogenesis in tumors.
- Accurate assessment of tumor vascularity is crucial for understanding tumor biology and guiding treatment.
Purpose of the Study:
- To evaluate if MVD in non-small cell lung carcinomas (NSCLC) indicates angiogenesis.
- To determine if MVD measurement from a single tissue block is representative of the entire tumor's vascularity.
Main Methods:
- Quantified MVD in 60 NSCLC specimens and 9 normal lung tissues using CD31 staining.
- Analyzed MVD in 47 blocks from four tumors to assess intra- and inter-tumor variability.
- Employed two quantification methods: average density (a-MVD) and hot spot density (h-MVD).
Main Results:
- Similar h-MVD in tumors and normal bronchus, but higher a-MVD in normal bronchus (P < 0.01).
- Significant inter- and intra-tumor MVD variations were observed.
- Single-block sampling achieved correct tumor ranking in only 68-74% (two-tier) and 6-16% (four-tier) of cases.
Conclusions:
- Elevated MVD in NSCLC may not solely represent angiogenesis.
- Sampling a single block may yield an inaccurate estimation of tumor vascularity, with accuracy potentially below 68%.