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Jan 22, - The development of substantial recent evidence indicates that a handful of viruses may have a role in breast cancer. These viruses are mouse mammary tumor virus (MMTV), bovine leukemia virus (BLV), human papilloma viruses (HPVs), and Epstein–Barr virus (EBV—also known as human herpes virus type 4). It's probably not news to you that viruses can cause cancer. In fact, viruses have been implicated in six different human cancers so far, such as the well-.