Definition of CNS prophylaxis

CNS prophylaxis: Chemotherapy or radiation therapy to the central nervous system (CNS) as a preventive treatment. CNS prophylaxis is given to kill cancer cells that may be in the brain and spinal cord, even though no cancer has been detected there.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=2766
Last Editorial Review: 3/19/2012