THEY are supposed to be grassroots organisations representing the interests of people with serious diseases. But Drummond Rennie, professor of medicine at the University of California, San Francisco, and deputy editor of the Journal of the American Medical Association, believes that some patient groups are perilously close to becoming extensions of pharmaceutical companies' marketing departments. http://www.newscientist.com/article/mg19225755.100?DCMP=NLC-nletter&nsref=mg19225755.100