This is so encouraging to hear, I am so happy for your mother.
My father is going through the same thing right now. They are irradiating his head to try to reduce the size and number of cancer cells there. Next week he starts chemo to try to kill off the tumors that are all over the rest of his body.
He did not have any noticeable cancer 4 months ago, so this is all very sudden and hard to deal with.
God Bless
