Hi:
According to the standard, the docs base the prognosis from the time symtoms are first noticed. These numbers are averages and everyone tumors are unique and each reponds differently to treatment. My wife was DXd 13 months ago and they said 6 months at that time, so that was not very accurate ??? Hope this helps....
Like the the other person who resoponded, you should ask your doc exactly what he/she is basing this on.
I'll keep you in my thoughts,
C