Parasites and biofilms, which is why ivermectin & fenbendazole works against so much of it. Other types come from toxins (mold toxins, pcbs, oxylates, etc) modifying the dna in particular ways. However, boosting the body's communication pathways & reinforcing lymph / blood oxygenation usually controls such problems. There's also some info that chlorine dioxide solves such problems of cancer. Some type of oxygen transport molecule that can permeate cell walls due to the molecule size, I think Not a doctor btw