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Wednesday, December 09, 2009 WASHINGTON: Being lonely could more than treble a woman's odds of developing breast cancer, research suggests. Isolation may also dramatically increase the number of tumours and their size. Although the findings were made in animal tests, the researchers believe they have important implications for human health. With loneliness already linked to a host of other illnesses from dementia to high blood pressure, they say it is important to consider a person's mental health when thinking about their physical health. The University of Chicago team looked at the effects of loneliness or 'social isolation' on female rats genetically predisposed to develop breast cancer. The breed is also one that is ' naturally gregarious', and, like humans, enjoys the company of others. The study found that animals living alone were 3.3 times more likely to develop types of breast cancer common in women than those in cages of five. The tumours were much bi...