Related Experiment Videos
Leaky tumor vessels: consequences for tumor stroma generation and for solid tumor therapy
1Department of Pathology, Beth Israel Hospital, Boston, MA.
Progress in Clinical and Biological Research
|January 1, 1990
Summary
Tumor blood vessels are hyperpermeable to large molecules, but these tracers remain localized in the stroma. Smaller molecules, however, can penetrate tumors from various vessels, suggesting potential for drug delivery.
Area of Science:
- Oncology
- Vascular Biology
- Biomedical Engineering
Background:
- Tumor microvasculature exhibits unique properties compared to normal tissues.
- Understanding vascular permeability is crucial for effective cancer therapy and drug delivery.
Purpose of the Study:
- To characterize the permeability of tumor vasculature to macromolecular tracers.
- To investigate the localization and diffusion of extravasated tracers within solid tumors.
- To explore the characteristics of leaky tumor vessels.
Main Methods:
- Utilized macromolecular tracers (FITC-D) of varying molecular weights.
- Studied solid transplantable animal tumor models.
- Analyzed vessel morphology and tracer distribution within tumor tissues.
Main Results:
- Tumor vasculature is hyperpermeable to macromolecules, primarily through venules and small veins.
- Extravasated high molecular weight tracers accumulate in tumor stroma near leaky vessels.
- Smaller tracers readily diffuse throughout tumors after extravasation from various vessel types.
Conclusions:
- Tumor vascular hyperpermeability is a key feature, but high molecular weight tracers show limited tumor penetration.
- The characteristics of leaky tumor vessels do not involve immaturity or specialized endothelium.
- Differential diffusion of tracers based on size suggests potential for targeted delivery strategies.