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Pulmonary tumors were induced in A/Jax strain of mice by a single injection of 3-methylcholanthrene and the tumors were transplanted into subcutaneous region of isologous hosts. Thus, five transplantable tumor lines were established. The tumors progressed gradually from benign to malignant during such processes. Five ascites tumors were derived from the transplantable lines and were further brought into in vitro culture. Examinations of these tumors by electron microscopy revealed the presence of intracisternal A-type and C-type virus-like particles. These data suggested that the amount of intracisternal A and C particles increased in the following order: Type-B cell of normal lung, primarily induced pulmonary tumor, subcutaneously transplantable pulmonary adenocarcinomas, intraperitoneal solid tumors of the ascites lines, ascites tumors, and the in vitro cultured cells.

Intracisternal A-type and C-type particles observed in pulmonary tumors in mice.