DUARTE, Calif. -- Patients with advanced cancer that has spread to many different sites often do not have many treatment options, since they would be unable to tolerate the doses of treatment they would need to kill the tumors. Researchers at City of Hope and St. Jude Children's Research Hospital may have found a way to treat cancers that have spread throughout the body more effectively. They used modified neural stem cells to activate and concentrate chemotherapeutic drugs predominately at tumor sites, so that normal tissue surrounding the tumor and throughout the body remain relatively unharmed."This approach could significantly improve...