lowering of innate resistance of the host to growth of seeded tumour cells induced by states of topical and systemic stress , and by the addition of an excess of lethally irradiated ( li ) tumour cells to i.v . injected intact tumour cells , were all potentiated by treatment of rats with aminophylline , an inhibitor of cyclic amp phosphodiesterase .
C0007595
growth of
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cells