Study Connects Breast Cancer Risk to Mirena IUD

Kamm - the study was actually published in Obstetrics&Gynecology. Here's a link to the abstract

http://journals.lww.com/greenjournal/Abstract/2014...

The part I find really interesting is that while they found a 20% higher than expected rate of breast cancer, the rates of pancreatic, uterine, ovarian and lung cancers were 30% to over 50% lower than expected.  Also, the study population was made up of women who had the Mirena inserted specifically to deal with heavy menstrual bleeding - which in my non-professional opinion seems to indicate that they were already dealing with a hormonal imbalance of some kind.  If the original imbalance was estrogen dominance, was that what actually made them more likely to get breast cancer?  Who knows.

Curveball - I assumed that fibroids were related to hormone levels because I was told that mine would most likely shrink/go away after menopause.  Also I assumed it was the hormones in the iud that lessened the bleeding whether from fibroids or another source. Before I found my BC, my obgyn was offering me the mirena to try to help my bleeding fibroid. 

 I found this on womenshealth.gov...

Because no one knows for sure what causes fibroids, we also don't know what causes them to grow or shrink. We do know that they are under hormonal control — both estrogen and progesterone. They grow rapidly during pregnancy, when hormone levels are high. They shrink when anti-hormone medication is used. They also stop growing or shrink once a woman reaches menopause.

Fibroids do respond to hormones with shrinking and growing. It is the localized hormone that causes the reduction in the endometrium which in turn reduces bleeding. But I would imagine it would also cause changes in fibroids.

this is the Study from Finoand:http://m.clickondetroit.com/health/breast-cancer-risk-may-be-higher-with-an-iud/26854630