Forty of 75 human cancers (53 per cent) survived transplantation to irradiated rats. Five of ten second-generation implants actually grew, and proliferative enlargements were subsequently identified microscopically. Little evidence was found for active growth in most persisting first-generation heterologous transplants. The technic described is considered sufficiently successful to warrant its wider use.

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This work was done under United States Atomic Energy Commission Contract AT(30-1)-901 at the New England Deaconess Hospital.

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