Abstract
The purpose of this study was to generate a selective radiosensitising effect by the intra-hepatic-arterial infusion of misonidazole (MISO). MISO (10 mg) was infused after transcatheter hepatic-arterial embolisation into the livers of rabbits bearing VX2 liver cancer. This procedure was followed by 15 Gy electron irradiation. Evaluation of tumour volume and histological examination was carried out on the 7th day after treatment. The greatest tumour response was obtained in the group which received MISO followed by radiation and was characterised by extensive fibrosis around the tumour and nearly complete tumour necrosis. Liver cell regeneration was also noted in adjacent liver tissue. The advantages of regional infusion of MISO following hepatic-arterial embolisation are: (1) Selectivity increased radiosensitivity of liver cancer alongside very low drug concentration in the plasma. (2) Reduced or absent deleterious side effects of MISO with higher tumour/normal tissue ratios of drug concentration. (3) Reduced cost due to the lower dosage of MISO required for regional infusion.
Highlights
(3) Reduced cost due to the lower dosage of MISO required for regional infusion
The hepatic blood flow pre- and post-Macroaggregated albumin (MAA) injection was evaluated by regional clearance of '"Tc radioactivity, which was represented as a mono-exponential curve as a function of time (Leme, 1984)
No significant difference was observed between the tumour volumes in the control group and the group receiving MAA embolisation alone (P>0.05)
Summary
Summary The purpose of this study was to generate a selective radiosensitising effect by the intra-hepaticarterial infusion of misonidazole (MISO)
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