What is the life expectancy of someone with breast cancer?

Not a simple answer: This question can't be answered without additional information. The stage of disease is very important to determine survival rates. For a stage 0, non invasive breast cancer, the survival rates are 95-98%.

Varies: Early breast cancer treated with surgery and appropriate hormone and radiation therapy has a 98% chance of full recovery. Larger or later breast cancers that have spread can have a lower survival expectancy, but there still can be successful treatment. Many factors play into life expectancy, and each person needs to discuss their specific situation with their oncologist.