Cancer is caused by cancerogens. There are three types of cancerogens - chemical, physical, biological. Standard combination therapy - Radio Therapy (a physical cancerogen), chemo-therapy (a chemical cancerogen). The methods of gene therapy using viruses (vectors) - biological cancerogens.

Each of these types of treatment, together and separately, increases the risk of cancer. Even the most healthy animal. Use in a sick animal - increases the risk of death.

The oncologists, based on science, treating the people by cancerogens.

Which to this substantiation is given?

This issue was discussed in my Medical Institute yet 30 years ago.

I wonder how to answer this question in other countries?