http://www.desaction.org/aboutdes.htm
DES (diethylstilbestrol) is a synthetic estrogen drug that was given to millions of pregnant women primarily from 1938-1971. Use of DES during pregnancy was thought to prevent miscarriage and ensure a healthy pregnancy. DES did not work, and women who took DES and the children they carried are at risk for certain health problems and may need special care. Find out if you were exposed to DES and if you were, tell your doctor.