Gs-antigen(s) of the D-type virus isolated from the continuous cells of human carcinoma was detected by the immunodiffusion with an indirect radioimmunoautographic assay in 5 of 7 human breast fibroadenoma. This virus contained gs-antigen common with the MPMV. These data demonstrated the genom of the D-type virus (or of a similar virus) to be integrated with the human fibroadenoma cells genom. Expression of the virus genom takes place at least to the level of the virus gs-antigen synthesis. The D-type virus from the continuous cell cultures of human carcinoma was associated with some human tumours, one of which was fibroadenoma.
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