Outside the cell it is the immune system that handles a virus. A strong host will set an acute inflammation while a weak one will tolerate a chronic (prolonged) inflammation. Inside the cell there are only two possibilities: either the virus kills the cell and produces more virons (a lytic cycle) or parts of it are incorporated into DNA of the cell and protect the cell from similar viruses (lysogenic cycle). In a dys-plastic field with high virus load (lytic cycles >> lysogenic cycles), where stem cells are also destructed (aplasia), tumor protects stem cells
destruction. Actually there is some crosstalk between hit stem cells to normal stem cell instructing them to transform (bystander effect).
Should virus load medically / dietetic-ally decline, tumor may become dormant
or shrink (meditation). Medically like for instance as Dr Coley did with Coley's toxins or in the future when virus interfere will be allowed (
presently prohibited by dogma). Virus interfere: please see presentation from Professor Zajicek on you-tube: "How to cure chronic Hepatitis,
In 1911 Francis Peyton Rous discovered the Rous sarcoma virus (RSV) which causes a chicken sarcoma. In 1960 Harry Rubin discovered a virus which prevents RSV from causing a chicken sarcoma, ..."