A substance generated in the liver during digestion to help prepare fats for absorption may also be a cancer assassin that can kill with precision, Canadian researchers have found. Scientists led by Concordia University discovered that lithocholic acid appears to selectively kill brain tumor, breast and other cancer cells but doesn't hurt nearby normal ones. What's more, lithocholic acid appears to stop tumors from releasing substances that make neighboring cancer cells grow and reproduce. The next phase of research will test the substance in mice models. Details of the study are published in the journal Oncotarget. Release