Abstract
Out of a group of 38 young hamsters which developed polyoma tumors following intranasal instillation of virus, 29 showed pulmonary sarcomas and an-giomas. In 15 of these only the lung tumors were observed. In a group of 161 hamsters injected by other routes (subcutaneously, intraperitoneal-ly and intracerebally), only 1 developed gross lung neoplasia.

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