The November 2012 study by Brophy and Keith on Breast cancer risk in relation to occupations with exposure to carcinogens and endocrine disruptors: a Canadian case control study. This study showed that women who work in certain occupations, most notably automotive plastics manufacturing and food packaging, have a higher risk of breast cancer as young women.
http://www.ehjournal.net/content/pdf/1476-069X-11-87.pdf
An accompanying study by DeMatteo et al on Chemical Exposures of Women Workers in the Plastics Industry with Particular Reference to Breast Cancer and Reproductive Hazards showed higher than normal workplace exposures to endocrine disrupting chemicals among women who work in the plastics industry and have a higher than normal risk of breast cancer.
http://baywood.metapress.com/link.asp?id=082184217v217371
The February 2013 Congressional Mandated Committee report Breast Cancer and the Environment: Prioritizing Prevention Report of the Interagency Breast Cancer and the Environment Research Coordinating Committee (IBCERCC). This report recommended a national strategy that shifts the focus of breast cancer research from diagnosis and treatment to the causes and prevention.
http://www.niehs.nih.gov/about/assets/docs/ibcercc_full.pdf
A February 2013 statistical analysis called Incidence of Breast Cancer With Distant Involvement Among Women in the United States, 1976 to 2009. This shows that advanced breast cancer is increasing in women under the age of 40 in the United States.
http://jama.jamanetwork.com/article.aspx?articleid=1656255
The State of the Science of Endocrine Disrupting Chemicals-2013 that finds that the rates of endocrine related cancers (breast, ovarian, prostrate, testicular and thyroid) and other hormone-related diseases are increasing globally and that reducing chemical exposures needs to become an important focus.
http://www.who.int/ceh/publications/endocrine/en/index.html
In Canada, the National Network on Environments and Women's Health has created a great new set of resources including summaries of the first two studies described above, a Plastics & Breast Cancer Q & A and a Women & The Automotive Plastics Industry quick facts guide to protecting your health.
http://www.nnewh.org/overview.php?section=4
A 2021 systematic review of epidemiological studies on Endocrine Disrupting Chemicals (EDCs) and their impact on breast cancer. Some of the chemicals included were DDT, bisphenol A (BPA), phthalates, per- and polyfluoroalkyl substances (PFAS), and polychlorinated biphenyls (PCBs).
https://www.tandfonline.com/doi/full/10.1080/10408398.2021.1903382