Hi Boatgirl, my cancer was hormone receptive also. I'm currently taking Tamoxifen for this. I also have a family history of Alzheimers. It is my understanding that the Tamoxifen doesn't stop the body producing oestrogen it just stops oestrogen binding to breast tissue.....? At this stage of the game I'm putting trust in my oncologist. For me the risk of BC reoccurrence is more immediate and threatening but I would love it if you would share any information you find with us. Good luck, thanks for bringing this up. Cheers, Ingrid xx