Most retroviruses cause cancers in their animal hosts.

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Retroviruses, such as the human immunodeficiency virus (HIV) and human T-cell leukemia viruses (HTLVs), have been linked to various forms of cancer in animals and humans. The retroviral genome can integrate into the host cell's DNA, leading to mutations and dysregulation of cell growth and division. However, not all retroviruses cause cancer and some can be beneficial, such as in the development of the placenta in mammals.

Most Retroviruses Cause Cancers in Their Animal Hosts