I can say that I have worked with my mother to *manage* her leukemia. We have been able to document (through testing done by her oncologist and our journals) the changes we have affected working with nutrition, structure and energy. She has done chemo in the past (a good amount of it) along with holistic treatments, but since ditching chemo and stepping up the other support she's done fabulously. She has had leukemia for 15+ years and swears she will never go back on.
We have used homeopathy, cell salts, drainage support, CST, acupuncture (no longer use this but did for a year or so, fairly successfully) diet (this is a BIG one....she can totally control her numbers this way-she does *great* on a sugar free, starch free, no chemical/refined food/processed anything diet.) She also has a regular spiritual practice and strives to remain active to encourage lymph flow. She rows regularly and does some bodyweight exercises.
She still sees her oncologist every 3 months and will likely continue to do so. But it's been a few years of switching to the natural methods-which admittedly takes more work-and she really is doing fabulously. My grandfather and uncle both had the same kind of leukemia and neither lasted for more than 1.5 years or so from diagnosis. This is a big deal.
I won't say that this is for everyone, or that everyone can avoid intervention. However even if she WERE undergoing chemo this would all be important, and not contraindicated. She will tell you diet and cell salts are the two major things that have altered her life completely. However I don't believe things would be going so well if she wasn't doing all that she is. I know they both produced immediate results, but I can't say they would have been as effective or lasted as long without taking the whole picture into account.