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Even more disturbing was their finding that these changes, which included "contact inhibition and anchorage-independent growth" (two markers of malignancy), were caused by concentrations "...up to 100 000-fold lower than those found in antiperspirants, and in the range of those recently measured in the human breast."
This new study dovetails with recent research demonstrating that aluminum binds to cellular estrogen receptors, indicating it may disrupt and/or drive proliferation within hormone-sensitive tissues. One research team coined a new term – "metalloestrogen" – to describe an entirely new class of metal-based endocrine disrupters, including aluminum, antimony, arsenite, barium, cadmium, chromium (Cr(II)), cobalt, copper, lead, mercury, nickel, selenite, tin and vanadate. This reclassification of what were formerly perceived to be hormonally inert substances should help to alert consumers to the significant health risk associated with the use of 'unnatural' products containing these elements.
While there is little extant animal research demonstrating aluminum's cancer causing properties, which is why it has not yet been classified with respect to carcinogenicity, "aluminum production" has been classified as carcinogenic to humans by the International Agency for Research on Cancer (IARC). There is also a 2011 study published in the Journal of Applied Toxicology that found aluminum content is higher in nipple aspirate fluid of breast cancer-affected women versus healthy controls.
Aluminum, of course, is widely distributed within our environment (reaching, at present, the highest level in documented history), and has even been implicated in atmospheric aerosols (i.e. geoengineering/ 'chemtrails'); which, incidentally, may be one reason why our soils are becoming saturated with the metal to levels toxic to plants, and why biotech corporations are presently working on developing aluminum-tolerant GM plants.
Because our regulators consider aluminum perfectly 'safe to eat,' apply topically, and inject into our bodies to "improve natural immunity," the emerging view of aluminum as possessing cancer-causing effects will put additional responsibility on consumers to educate themselves and make choices to protect themselves from avoidable exposure.
Education equals empowerment. Learn more about how to protect yourself against aluminum by reading the following articles:
 F Mannello, D Ligi, M Canale. Aluminium, carbonyls and cytokines in human nipple aspirate fluids: Possible relationship between inflammation, oxidative stress and breast cancer microenvironment. J Inorg Biochem. 2013 Jul 12. Epub 2013 Jul 12. PMID: 23916117
 André-Pascal Sappino, Raphaële Buser, Laurence Lesne, Stefania Gimelli, Frédérique Béna, Dominique Belin, Stefano J Mandriota. Aluminium chloride promotes anchorage-independent growth in human mammary epithelial cells. J Appl Toxicol. 2012 Jan 6. Epub 2012 Jan 6. PMID: 22223356
 Daniel Krewski, Robert A Yokel, Evert Nieboer, David Borchelt, Joshua Cohen, Jean Harry, Sam Kacew, Joan Lindsay, Amal M Mahfouz, Virginie Rondeau. Human health risk assessment for aluminium, aluminium oxide, and aluminium hydroxide. J Toxicol Environ Health B Crit Rev. 2007 ;10 Suppl 1:1-269. PMID: 18085482