Most breast cancers occur in the upper, outer quadrant of the left breast near where right handed people apply antiperspirants. This sounds like plausible evidence for a link – is it?

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Most breast cancers occur in the upper, outer quadrant of the left breast near where right handed people apply antiperspirants. This sounds like plausible evidence for a link – is it?

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It has been known for over 50 years that breast cancer predominantly affects the left breast, but this is not because of ‘over application’ of antiperspirant by the majority right-handed people. Detailed consumer research, which involved placing a recording device into aerosol antiperspirants and measuring exactly the volumes applied to both armpits, has shown that there are no significant differences between the amounts of antiperspirant applied to either armpit, regardless of whether you are right or left handed. Research in the late 1990s has attributed the prevalence of breast cancer in the left breast to development in the womb, during which time early growth of the heart in the left side of the chest means that additional blood supply is needed in this area. It is the extra arteries, veins, and capillaries on the left hand side of the chest that make the left breast more vulnerable to cancer. It is also well documented that 60% of breast cancers occur in the upper outer quadrant

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