There has been some thought-provoking material published at the Natural News.com site about the ill-effects of chemotherapy on cancer treatment, that this does not get to the root of the cancer problem, but in the case of breast cancer, and maybe other cancers, may spread it:
https://www.naturalnews.com/2017-07-10-chemotherapy-found-to-spread-cancer-throughout-the-body-warn-scientists.html
https://www.naturalnews.com/2018-07-18-health-basics-quiz-which-kills-more-americans-cancer-or-chemotherapy.html
“A new study published in the journal Science Translational Medicine earlier this month proved what we have been saying for decades; conventional cancer treatments cause more cancer. A team of scientists at New York’s Albert Einstein College of Medicine has found compelling evidence that chemotherapy is only a short-term solution. Eventually, the drugs will make you sick again, pushing patients towards a second round of expensive treatments. Clever money generating trick: Instead of helping patients to get rid of the disease, they temporarily put it on hold so they can take the dollars twice. The New York scientists explained that while shrinking the tumors, chemotherapy simultaneously opens new doorways for tumors to spread into the blood system, triggering more aggressive tumors which often result in death. The researchers believe toxic chemo drugs switch on repair mechanisms in the body that allow tumors to grow back faster. Furthermore, Dr. George Karagiannis, lead author of the study, and his team found that two common chemo drugs increased the number of “doorways” on blood vessels which allowed cancer cells to spread to other parts of the body. The team also discovered that chemotherapy increased the number of cancer cells circulating the body and lungs of mice.”