Not sure: The incidence of breast cancer has remained fairly fixed for the past 50 yrs. The rate is about 1 in 7 developing the tumor which is the same in all countries exposed to the mouse with the MMTV virus. In Australia where there are mouse plagues the rate changes to 1 in 3 during the plague. Alcohol, when reducing immunity if taken in excess can enhance certain cancer such as oral squamous Ca .
Answered 8/10/2015
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