What do the terms incidence rates and mortality rates mean? Do they ever differ?
An incidence rate is calculated by dividing the number of new cases of a particular cancer during a given period of time by the number of people known to be at risk. A mortality rate is calculated by dividing the number of people who have died of a particular cancer during a given period of time by the total population at risk. Mortality rates and incidence rates are not necessarily predictive of each other. Comparison of mortality data in population groups or regions can suggest needs for improved screening, treatment accessibility, or education. Incidence rates reflect all cases that have occurred, not just those resulting in death, and help focus on early detection and prevention issues. How is a person’s cancer treated? Cancer is treated with surgery, radiation therapy, chemotherapy, hormone therapy, or biological therapy. The doctor may use one method or a combination of methods. The choice of treatment depends on the type and location of the cancer, whether the disease has spread
