Objection:To study the relationship between different doses and biological effect of 32P-glass microspheres(32P-GMS) by percutaneous intra-tumor injection at different times and provide proofs of theory for clinical therapy.Methods:36 Zealand rabbits and Vx-2 were used to establish the animal model of liver tumor.Six groups were randomly designed.The suspension of different radiative doses of 32P-GMS combined with lipiodol-ultrafluid(0.1 mL) was respectively injected by percutaneous intra-tumor.The tumor tissues were examined by light microscope.MRI examination of liver tumors were performed before and after the injection.Results:C and D groups were observed that the tumor volume was decreased and the rate of restrained tumor was gradually increased after injection of 32P-GMS.The living tumor tissues of E group completely disappeared after the injection for two weeks.MRI examination showed that the tumor signal of E group was equal as T2 as the signal of normal liver parenchyma.The living tumor tissues were not found in F group after the injection for three weeks.Conclusion:111 MBq was the best radiative dose of 32P-GMS for treatment of 1 cm liver cancer by percutaneous intra-tumor injection.MRI examination was very valuable to evaluate the result and follow up after the injection to treat liver cancer.
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