Abstract
Sauerbruch and Heyde have united animals side by side, with an opening between the peritoneal cavities and suture of the apposed skin and connective tissue. They find that healing between two individuals thus joined brings with it a considerable physiological intimacy. Ranzi and Ehrlich, following them, have demonstrated that circulating antibodies pass with ease from one of such a pair to the other. On this evidence it seems possible to utilize the condition (parabiosis) for experiments on the question of the existence or non-existence of circulating antibodies for cancer. Accordingly, I have united white rats with a growing tumor, the result of transplantation, to others which had proved themselves resistant to the same type of neoplasm. Careful watch was kept for signs of retarded development or retrogression in the tumors thus brought under the continued influence of blood from a resistant animal, but no alteration of the sort was observed. The growths extended with the same rapidity as those in control animals. The findings are against the presence in circulation of destructive antibodies for cancer.
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