Examples:
Women
with a known genetic risk who opt to have surgery to remove their fallopian
tubes and ovaries participate. They are then monitored for many years to see
if the surgery prevented the development of ovarian cancer.
Women at high risk for ovarian cancer receive a “chemoprevention therapy” – drugs that try to prevent the development of cancer. They are monitored for many years to see if the therapy prevents the development of ovarian cancer.