Summary
Human adenovirus type 9 (Ad9) elicits exclusively estrogen-dependent mammary tumors when injected into female rats. Three different histological types of mammary tumor (benign fibroadenomas, phyllodes tumors, and malignant solid sarcomas) have been described in Ad9-infected animals, with benign fibroadenomas being seen most frequently. Interestingly, in contrast to other adenoviruses, in which oncogenic viral functions are entirely encoded within the E1 region, Ad9 requires an E4 region transforming protein (ORF1) for its unique mammary oncogenicity. Studies of Ad9-induced rat mammary tumors may lead to a detailed molecular understanding for the development of fibroadenoma, a common human breast tumor.
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Javier, R., Shenk, T. Mammary tumors induced by human adenovirus type 9: A role for the viral early region 4 gene. Breast Cancer Res Tr 39, 57–67 (1996). https://doi.org/10.1007/BF01806078
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DOI: https://doi.org/10.1007/BF01806078