Three recent scientific papers looking at ADHD treatment and other health outcomes. Why no one knows what your cancer treatment will do to your ovaries. In a small US study, brain cancer tumours shrank rapidly in the first few days when treated with chimeric antigen receptor, or CAR, T cells injected into the fluid around the brain. And suicidal thoughts are more common than researchers expected in people who do not fit with conventional diagnoses of depression or other psychiatric disorders.