She received her M.D. from the University of Buenos Aires in Argentina. Since her U.S. arrival in 1973, her research interest has been the control of cell proliferation in metazoan organisms. In particular, she studies the regulation of cell proliferation by sex steroids in breast and prostate cells, and possible health effects in humans due to hormone mimics exposure. Dr. Soto has served on the National Academy of Sciences Committee on Hormone Active Agents and other panels dealing with endo crine disruptors. In 1995 she shared the Marla Frazin award for breast cancer research with Dr. Carlos Sonnenschein. Drs. Soto and Sonnenschein are currently working on a book concerning the control of cell proliferation.