HI Pink Girl there is some material here that you could show to your onc.
I do not recall the Princess Margaret study - Do you have a link?.
This is the result of an NCBI search on BC and flax seed and flaxseed
http://www.ncbi.nlm.nih.gov/sites/en...%20flax%20seed
http://www.ncbi.nlm.nih.gov/sites/en...cer%20flaxseed
These are previous posts on this site that are particulalry useful
http://her2support.org/vbulletin/sho...+seed+estrogen
http://her2support.org/vbulletin/sho...+seed+estrogen
http://www.her2support.org/vbulletin...highlight=flax