Doctor my friend is 42 years old and she has got stage 4 metastasis breast what is the survival rate/... for how many years will she survive?.

Stage IV: ... means cancer has metastasized to distant locations outside of the breast. There is no established therapy for cure at this stage; but therapy may improve survival time and quality of life. Numerous factors influence survival time. In the U.S. half of women lived less than 2 yrs, but 20% of women lived more than 5 years. As a friend you may be very important for providing emotional support.