Around 1% Paget's disease of the bone (and i assume you bone, not nipple) in about 1% of cases gives rise to aggressive cancers. Let's hope this does not happen to you. A few patients with paget's died as a result of high-output heart failure from the arteries connecting directly with veins in the bone; hopefully with today's treatment this will not happen. Good luck.
Depends on stage. If your talking about page's disease of the breast (there is also paget's of the bone, which is benign): if lymph nodes are negative, 5 year survival is about 85% and 10-year survival is about 79%. If the lymph nodes are positive, 5 year survival is 32% and ten year is 28%.