DQ,
it took me nigh on several weeks to complete the research into the Orthopathic (Natural Hygienic) evaluation of the cause of cancers, which I had known previously were ultimately derived from a Toxemic state of the body.
I do totally agree with your comment in reply to WIEL...........
"elements of the cancer cells become viral and the viruses are then able to infect other cells and move through the bloodstream to create secondary tumors".
but I would add (opinion) that this is AFTER the body succumbs to the strain of the "containment" of the cancerous tumor/s and then developing from a sometimes benign beginning to a malignant and metastasized state via the process you have mentioned.