For your own [and your Mom's] well-being, I very much encourage you to think for yourself. There are NUMEROUS studies of people with all sorts of cancer(s) greatly benefiting from the use of ascorbate. http://www.vitamincfoundation.org/vitcancer.shtml
As Schopenhauer put it, "Really significant steps forward for mankind go through three stages. First, they are ridiculed. Second, they are heavily fought by those who have economic interests in the status quo. And finally, when the dam is breaking, everyone says: Well we knew it all along."
The above posted material [by #174156], from my view, is simply the "economic interests" trying to protect their "turf." It has always been that way, and probably always will be.
I wish you the best of success, Sachiko, in finding a solution to your Mom's cancer situation.