Chemotherapy saves lives, but new studies--including research led by coauthor Dr. Dan Silverman--reveal that the agents used to kill cancer cells may also impair normal brain function. Even years after treatment, patients report problems with memory, concentrating, multitasking, and word retrieval. As one person put it, "I've lost my edge." If you've undergone chemotherapy, perhaps you're among those who've had trouble following the thread of a conversation...