DNA Synthesis as a Marker in Fractionated Radiation Therapy

Abstract
Exposure to ionizing radiations produces a marked suppression of DNA synthesis by mouse tumor. This is predominantly due to a decrease in the number of cells in the synthesis phase. This suppression lasts several days and is followed by a recovery and rebound on the third to the fifth day. Human tumors show a similar cyclic change after irradiation. Normal intestinal mucosa follows a similar suppression-recovery rebound pattern but with a shorter interval. The possibility of increasing effect by synchronizing radiation exposures with the rebound phase is suggested.

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