chemopreventive

Definition of chemoprevention
National Cancer Institute

chemoprevention

(KEE-moh-pree-VEN-shun)
The use of certain drugs or other substances to help lower a person’s risk of developing cancer or keep it from coming back. For example, tamoxifen and raloxifene are drugs that may be used to prevent certain types of breast cancer in women who are at high risk of developing the disease.

Source: NCI Dictionary of Cancer Terms