EVANSTON, Ill. -- A recent Northwestern University study found that a new treatment using stem cells might extend the lives of patients with lupus. Stem cell treatments could help patients with severe cases who have not responded to other options, according to a study published in the Feb. 1 issue of The Journal of the American Medical Association. Lupus is a disease that causes patients' immune systems to become unable to distinguish between foreign substances and normal parts of the body. This causes the immune system to attack the patient's own cells and tissues instead of protecting them. Researchers, including...