My wife developed breast cancer after going on estrogen replacement. She did not take it orally, but wore a patch which delivered the hormone. My understanding was that estrogen does not necessarily cause breast cancer, but feeds it. So, if any cancer cells are lurking, they will not die off but will be fed by the estrogen and will develop into full-blown cancer.
75% of cancers spread to the bones eventually.
I take Arimidex but it causes bone pain and arthritis. So I take the supplement MSM to help that. I really recommend that to any post-treatment breast cancer patient who is getting bone pain from the post-treatment drugs they keep you on for five years. It’s a common complaint with these drugs. Yeah, it might reduce your risk of recurrence but your bones start cracking and just walking can be painful. That’s what people don’t understand about breast cancer: there are long term side effects that result. When your treatment is over it’s still not over for you. They will always look on you as a sick patient.
Oral contraceptives or contraceptive patches, increase the risk for gynecological cancer like smoking increases the risk lung cancer, coronary artery disease, etc. I'm sorry to read about your wife.