Some biological factors increasing the radiosensitivity of an isogenic mammary tumor in C3H mice.

There were also no cures in the group of 11 uninoculated controls treated towards the end of this series of experiments, indicating that no inherent increase in radiosensitivity had appeared fortuitously during the serial transmission of this tumour line. The over-all three-month cure rate of 30 per cent among the 208 mice receiving irradiated inocula, compared with no cures among the concomitantly treated controls, furnishes highly significant additional evidence of the radiosensitizing properties ascribed to radiation-attenuated isografts.

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