NCIt definition : Any surgical procedure undertaken prior to the occurrence of a disease/disorder, the
goal of which is to prevent the disease/disorder from developing.;
Alternative definition : NCI-GLOSS: Surgery to remove an organ or gland that shows no signs of cancer, in an
attempt to prevent development of cancer of that organ or gland. Prophylactic surgery
is sometimes chosen by people who know they are at high risk for developing cancer.;