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Potentiating effect of prior local irradiation of the lungs on pulmonary metastases.

Abstract The survival and clonogenic growth in the lungs of rats and mice of single cancer cells injected intravenously are markedly increased when the lungs have been locally irradiated (LTI) before the injection of tumour cells. The maximum stimulation of tumour growth by LTI was found to occur 7–21 days after the lungs had been irradiated with a single dose of 1,250 rads or a fractionated dose of 5 × 350 rads spread over nine days. Although the fractionated treatment caused less damage to the skin of the thorax and lungs of rats, it caused earlier and more marked stimulation of tumour growth in the lungs, and tumour colony forming efficiency (CFE) had already increased on the day the last fractionated treatment had been given to the lungs. CFE did not decrease to near-normal values until six or more weeks after completion of treatment. Stimulation of CFE by local irradiation appears to be related in time to the reactive regenerative phase of tissue repopulation and repair of radiation damage to pulmona...