Yes: App. 10-15% of all breast cancers are believed to be related to hereditary risks; therefore, in a sense, the other 85-90% are related to "environmental" factors. Unfortunately, we don't know what specific triggers are responsible for breast cancer development; but, we do know that breast cancer occurs much more frequently in developed countries. This, regrettably, is a disease of modern life.
Answered 12/9/2013
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Possibly: It is possibly related to the environment. Also genetics, hormones and other factors are at play.
Answered 11/4/2012
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Sometimes : Many things contribute to developing breast cancer. Only about 10% of breast cancer are inherited. Others are brought on by other factors. “Environmental” effects we are aware of that contribute to the risk of breast cancer include alcohol consumption, obesity, radiation to the breast (especially at young age such as to treat Hodgkin disease), and estrogen consumption (as in hormone replacement)
Answered 12/28/2017
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