Professor Doug Easton, genetic epidemiology expert at the University of Cambridge, who analysed the data said the results would "greatly improve" the understanding of how prostate cancer develops.

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The Epitwin Project is the brainchild of Tim Spector, who heads the Twin Research Unit at St Thomas's and is Professor of Genetic Epidemiology at Kings College London.

BBC: 'Not-so-identical' twins may hold the key to disease