The other common legal usage of vacate refers to the canceling or rescinding of court judgments and orders. State and federal rules of Civil Procedure give courts the authority to modify prior judgments.
Cancer prevalence is defined as the number of living people who have ever been diagnosed with cancer. It includes people diagnosed with cancer in the past as well those who were recently diagnosed. Cancer prevalence is determined by how often a cancer occurs (incidence) and by how long people normally live after diagnosis (survival). This means prevalence counts are highest for the most common cancers with the longest survival.
Incidence is the frequency with which an event occurs within a given time period (such as one year). For example, it could be said that the incidence of new breast cancer cases in 2007 demonstrated 50,000 new cases. By contrast, prevalence refers to how many people currently have that condition this year.