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Tumor type and vascularity: important variables in infusional brachytherapy with colloidal 32P
H Nguyen1, G Ghanem, R Morandini
1Department of Radiation Oncology and Nuclear Medecine, Mallinckrodt Medical, Inc., Brussels, Belgium.
International Journal of Radiation Oncology, Biology, Physics
|October 6, 1997
Summary
Colloidal 32P uptake and retention in tumors depend on histologic characteristics and vascularization. Tumor vascular density influences the effectiveness of infusional brachytherapy, impacting treatment outcomes.
Area of Science:
- Oncology
- Radiotherapy
- Biomedical Engineering
Background:
- Colloidal 32P is used in infusional brachytherapy for solid cancers.
- Understanding its uptake and retention is crucial for optimizing treatment efficacy.
Purpose of the Study:
- Investigate how histologic tumor characteristics and vascularization affect colloidal 32P uptake and retention.
- Evaluate the cytotoxicity of colloidal 32P in melanoma and squamous cell carcinoma models.
Main Methods:
- In vitro analysis of colloidal 32P uptake in melanoma (HBL), squamous cell carcinoma (SCC1), and fibroblast cell lines.
- In vivo study of colloidal 32P retention in HBL and SCC1 tumors in nude mice.
- Determination of tumor vascular density using Masson's trichrome staining.
Main Results:
- Maximal colloidal 32P uptake occurred within 10-20 min for SCC1 and HBL tumors, versus >60 min for fibroblasts.
- HBL tumors showed higher colloidal 32P retention compared to SCC1 tumors, with less liver uptake.
- Lower vascular density in HBL tumors (5.7 vessels/mm²) correlated with better retention than in SCC1 tumors (21.4 vessels/mm²).
Conclusions:
- Intratumoral colloidal 32P infusion can complement radiation therapy for accessible solid tumors.
- Tumor vascularization is a critical factor for successful vascular blockade with macroaggregated albumin (MAA) before colloidal 32P infusion.