It all depends on the person and the doctor. And of course God. A friend of mine had cancer that spread to her brain. Quickly I might add. They diagnosed her in Sept. and in March she passed. The lung cancer cleared up but she got weak, took her to the local hospital they shipped her to Tampa, where they drained the fluid on her head, they sent her back here to hospice and she lasted close to 2 weeks. I am so sorry to hear about your Mom. May God be with both of you.