Definition: Bromodeoxyuridine (BdU) is a nucleoside analogue that was first synthesized by Dr. Jonas Salk in 1958 and has subsequently been used for various therapeutic purposes, including cancer treatment. The primary function of Bdu is to prevent DNA damage caused by radiation or chemotherapy drugs during the treatment process. It is also used as a diagnostic tool in certain cancers and can be incorporated into gene therapy approaches to treat genetic mutations that cause cancer.