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Parabens are esters of para-hydroxybenzoic acid, from which the name is derived. Common parabens include methylparaben (E number E218), ethylparaben (E214), propylparaben (E216), butylparaben and heptylparaben (E209). Less common parabens include isobutylparaben, isopropylparaben, benzylparaben and their sodium salts.
The study examined only the presence of parabens in the tumors but did not determine that they were the cause of the tumors.(5) A follow up study released in 2012 confirmed the presence of parabens in 99% of tested cancerous breast tissue, but did not make a direction connection to the cancer and the parabens.