Enlarge Image Root killer. Cancer-like stem cells treated with the antipsychotic drug thioridazine (right) are scarce compared with control cells. Credit: E. Sachlos et al., Cell, 149 (8 June), ©2012 Elsevier Inc. A well-known drug for treating schizophrenia may be a cancer killer, too. In lab studies, the drug wiped out a precursor to leukemia cells without harming normal cells. That means it could give doctors a long-sought way to eliminate every trace of leukemia in patients so that the cancer can never come back. Even though surgery, chemotherapy, and radiation can get rid of a tumor or leukemia...