How much time do you have before a brain cancer victim dies?

Anonymous
My mother has an abnormality in her brain and I believe that it might be cancerous. How long will it be before she is no longer with me? I believe they started scanning her brain 2 months ago and I believe that she has been having problems with mental functioning for about 4-6 months now. How much time do you think she has left?
How much time do you have before a brain cancer victim dies?
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