Why would you assume that anyone would choose chemotherapy?  I have already informed my health-care provider that, were I ever to get cancer, I would not allow chemotherapy or radiation to be performed upon my body.  There are plenty of less-invasive, alternative therapies available, but the medical community would never consider them, just like it does not approve of CBD oil for depression and pain.  Everyone I know who has had cancer, and has had conventional therapies, has had the cancer chased to other parts of their bodies, or had it return with a vengeance.  They may have had a few-more years, but at what expense and with what quality of life?  A friend who has had breast cancer forced into remission is now confined to her sofa.  She has no strength, is tired all the time, and looks like death warmed over.  But she will tell you, proudly, that she "beat cancer."  Really?