How long can I live with an untreated breast cancer?

It is not possible to answer that for you as an individual, since there are such marked individual variations in resistance. Each one of us has a somewhat different biology in this regard. In general this condition if untreated is compatible with a life expectancy of two to two and a half years. But be aware that survival does not necessarily mean comfort and tranquillity. Uncontrolled cancer of the breast can be a dreadful experience. The whole purpose of treatment is to avoid the consequences of growth and spread of this tumor.