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Relative increase in SCC-61 and nu61 tumors as a function of time after irradiation. Tumors were permitted to grow to a volume of 250-300 mm3. At that time (day 0) the tumors were subjected to six 500-cGy irradiations as described in Materials and Methods. Measurements of relative tumor volumes were performed during 32 days. Growth delay was defined as the time, necessary for irradiated tumor to increase relative volume by 50%, compared to the volume on day 0. Error bars are SEM.
