Article summary: Statistics show that chemotherapy for cancer treatment saves lives. Evidence has been mounting over several years that shows patients may pay a high price: their neurons and other cells in the brain. Research led by Harvard University neurologist Michelle Monje found that both chemotherapy and radiation damage the repository of stem cells in a brain structure called the hippocampus." "  The seahorse-shaped structure is the site where stem cells are generated and the new memories begin to be formed. Chemotherapies and radiation, by attacking cells' DNA, can all but stop the development of stem cells. Radiation appears to damage…