HISTOPATHOLOGICAL OBSERVATIONS OF SPONTANEOUS REGRESSION OF ROUS SARCOMAS IN JAPANESE QUAILS

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  • Histopathological observations of spont

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Tumors induced in Japanese quails by the Schmidt-Ruppin strain of Rous sarcoma virus were examined histopathologically. The following three phases were recognized in the quails whose tumors regressed finally (regressor) . Phase I was between days 4 and 7 of virus inoculation, when growth of tumor cells was seen with predominant infiltration of heterophils. Phase II, from days 10 to 14, was characterized by necrosis of tumor cells and focal accumulation of lymphoid cells which frequently formed follicle-like nodules. In phase III from days 18 to 24, tumor cells and heterophils disappeared, whereas diffuse infiltration of lymphoid cells, plasma cells and histiocytes were demonstrated.<BR>In the quails whose tumors progressed (progressor), growth of tumor cells and infiltration of heterophils at phase I seemed to follow a pattern similar to that of regressors, but subsequent infiltration and focal accumulation of lymphoid cells were rare. These morphological findings suggested an immunological reaction against tumor cells by lymphoid cells.

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