Social isolation and related stress could contribute to human breast cancer susceptibility, research from a rat model designed at the University of Chicago to identify environmental mechanisms contributing to cancer risk shows. The researchers found that isolation and stress result in a 3.3-fold increase in the risk of developing cancer among rats with naturally occurring mammary tumors...![](/proxy.php?image=http%3A%2F%2Ffeedads.g.doubleclick.net%2F%7Ea%2FTNPWkjRE-ZV5V8C6gTmu33T2csU%2F0%2Fdi&hash=508853a3545c094978c7bdccaef9dc79)
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