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1 Biology Division, Oak Ridge National Laboratory, Oak Ridge, Tenn.
The development of spontaneous lymphoma in a high leukemia strain of mice
was inhibited by administration of cortisone, although the hormone-induced
atrophy of the thymus and other lymphoid tissues was only transient. Inhibition of lymphoma formation resulted from only three successive daily
injections of cortisone but was greater if the cortisone administration was prolonged for three months. A high incidence of myeloid leukemia was induced in a low-leukemia strain
of mice by a single exposure to 350 r of x-radiation. Cortisone was without effect on the induction of myeloid leukemia. Cortisone administered preirradiation increased, and postirradiation decreased, the incidence of radiation-induced lymphomas in male mice.
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