Estrogen receptor content in adenovirus type 9-induced rat mammary tumors
Hormonal factors play an important role in the induction of mammary tumors and tumor-like lesions in adenovirus type 9-inoculated W/Fu rats. Primary Ad 9-induced fibroadenomas contained significantly higher amounts of estrogen receptor (determined by means of enzyme immunoassay) in comparison to normal breast tissue (p = 0.01**) and 'spontaneous' fibroadenomas (p = 0.03*), used as control tissues.