Re: stage 4 chemo/radiation
I am sorry to hear about your mother. From what you say, she has colon cancer as opposed to rectal cancer. My understanding is that radiation therapy is not a common way to treat colon cancer, though it may be used in certain circumstances....not sure why, but I am sure someone else can advise on this.
Hopefully, the chemotherapy will shrink the tumour sufficiently to be able to remove it. I wish your mother well. Please post back with any more questions you may have and we will try to answer the best we can.