We have known for decades that viruses =can couse breast cancer in animals (Mouse Mammary Tumour Virus – MMTV). Evidence has been accumulating that retroviruses may play a part in human breast cancers. This short review summarizes iur prsent state fo knowledge.
Recent developments linking retroviruses to human breast cancer: infectious agent, enemy within or both? J Gen Virol. 12 Sep 2014. doi: 10.1099/vir.0.070631-0
Evidence is accumulating that one or more beta-retrovirus is associated with human breast cancer. Retroviruses can exist as an infectious (exogenous) virus or as a part of the genetic information of cells due to germline integration (endogenous). An exogenous virus with a genome that is highly homologous to mouse mammary tumor virus (MMTV) is gaining acceptance as possibly being associated with human breast cancer and recently furnished evidence is discussed in this article, as is the evidence for involvement of an endogenous human beta-retrovirus, HERV-K. Modes of interaction are also reviewed and linkage to APOBEC3 suggested.