Keep Tumors Alive To Contain Cancer?

This is very interesting. I've been thinking that maybe one of the keys to preventing resistance to chemotherapy and radiation is promoting the health of normal cells with natural substances like resveratrol and turmeric, which would reduce treatment toxicty. There are plenty of studies indicating compounds that not only don't interfere with standard treatment, but seem to enhance it by reducing the proinflammatory and prometastatic aspects of conventional treatment while protecting normal cells from damage. It's a shame that we aren't applying very much of what we have learned. It just seems like a push to kill "bad guys" (the cancer cells) rather than tip the balance in favor of the body's natural defenses. Why do we not care about natural killer cells until BC is stage IV and we are testing expensive cutting edge immunotherapy drugs?