A new study by the American Association for Cancer Research has found that high levels of psychosocial stress--particularly among black and Hispanic breast cancer patients--are linked with aggressive forms of breast cancer. These patients tended to have more aggressive tumors but the association isn't entirely clear. Whether the stress levels of these women affected tumor aggressiveness or being diagnosed with an aggressive cancer caused their stress levels to rise hasn't been determined. Both instances may be significant.
http://aacrnews.wordpress.com/2011/09/19/association-found-between-stress-and-breast-cancer-aggressiveness/
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