A rabbit brain tumor model using transplanted VX-2 carcinoma had an 85percnt; rate of successful implantation. Rabbits lived 8.5 plusmn;1.3 days. The tumor doubling time was 0.5 to 2.6 days. Some tumors were shown as early as four days after implantation and all tumors were seen by ten days after implantation. Two of three rabbits receiving radiation therapy to the tumor had significant extension of life. This model is a useful radiologic research tool.
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