Can soybeans really treat cancer?

The soybeans come from Asia and in Europe
they appeared at the end of the 18th century. In  countries such as Japan, where soy is the base for all kinds of food, it seems that the risk of cancer and heart disease is lower than, 
other countries in Europe, where people don't usualy use soybeans. 
Scientists from the University of Milano, Helsinki, Michigan, as well
as from the Medical Center of Stanford University, California, studied the soybeans and they 
got to the fact that soy, used everyday, helps preventing and treating 
breast cancer, lung cancer and heart disease.
                                                       
                                                                                  Soy food
This also was the conclusion of almost 100 scientists that took part in the third 
International Symposium about "Soy, preventing and treating chronical diseases.", in Washington, 1999.