"Poor access to screening and therapy is clearly an important factor. But according to a novel collaboration between sociologists and biologists, the strain of living in some of the toughest neighbourhoods in the US may cause biological changes that lead directly to earlier deaths.
"Results from the collaboration indicate that social isolation and a fear of crime cause an overload of stress hormones that can change cell biology, sending tumours into overdrive. 'We're showing that your social environment can affect your health directly,' says Suzanne Conzen<http://www.uchospitals.edu/physicians/suzanne-conzen.html>of the University of Chicago. 'It goes into gene expression. That concept is really new ...'"
http://www.newscientist.com/article/mg20527433.900-poor-neighbourhoods-can-kill.html
-- "Hige sceal þe heardra, heorte þe cenre, mod sceal þe mare, þe ure mægen lytlað."