[tzs]

It's also possible that it increases cancer rates without causing cancer. Instead, it might be preventing the body from stopping new cancers that otherwise would have been stopped.

The observed cancer rate will be roughly the difference between the rates of cancers that start and cancers that are stopped by either the cell's internal repair mechanism or by the body's mechanisms for finding and killing bad cells. Something that affects the observed rate could be acting on either side of the difference.