Hormone therapy keeps cancer down by 50%. If your chance of recurrence is 70% then tamoxifen will reduce your recurrence to 35%. If your chance of recurrence is 2% then it reduces it to 1%. However, I have heard that 1/4 cup of ground flax seed daily is more efficacious than tamoxifen! It should be organic and ground with a coffee grinder prior to eating. I have been testing my CA 15-3 after 2 months of flax and an AI and mine reduced fr 32 to 20.