Some cancers are preventable with a vaccine – a virologist explains || by Ronald C. Desrosiers :: The Conversation

One-fifth. Nearly 20% of cancers worldwide are caused by a virus.
These viruses don’t cause cancer until long after they initially infect a person. Rather, the viruses teach the cells they take over how to escape the natural biological process of cell death. This strategy sets these altered cells on a path for other genetic changes that can cause full-blown cancer years down the road. Read more