Right now there is no known way to prevent Wilms tumors. Experts think the cancer comes from cells in the fetus that failed to grow into mature kidney cells. This doesn't seem to be caused by anything that a mother could avoid.
Very rarely, children have syndromes that make them almost certain to develop Wilms tumors. Doctors may recommend removing the kidneys at a very young age (with a donor kidney transplant later on) to prevent tumors from developing.
Last Revised: 08/01/2012