I too had been taken Premarin for ten years and at the ten year mark developed breast cancer. There is no familiar history. I believe there is an ongoing study on estrogen only drugs to see
the actual relationship it plays. I know there is at least a hint that long term use of ERT plays a role. I haven't heard any connection with dementia. If you understand the role that breastcancer therapy such as Tamoxifen and Armidex etc. play, working as ANTI-estrogen, it baffles me why there is still question whether the reverse, given menapausal women estrogen long term can play a role in the development of breast cancer. Once the study results are released it may add support and then you may find attorneys willing to take a case but you need support for a claim. Good luck! I would be interested to know how you make out.