Hi Tanya welcome.
Flax has been the regular subject of discussion on the main message board, including consideration of the phyto-oestrogenic effects, references to trials etc.
You should be able to find them searching under flax flaxseed etc on the main board.
There are a few dietary threads on the main board including mine on Omega 3 and 6, a thread on vitamin D, Rhondas thread on the Dyer breast cancer diet etc.
http://her2support.org/vbulletin/sho...ght=greek+diet
http://her2support.org/vbulletin/sho...hlight=vitamin
http://her2support.org/vbulletin/sho...st+cancer+diet
and many more on a variety of topics.
In respect of flax the main issue raised in BC seems to be the phyto-oestrogens
In general terms according to a flaxseed / BC researcher oil does not contain phyto-oestrogens.
Some argue that the phyto oestrogens are beneficial and other think they pose concerns. The researcher suggested they displaced oestrogen and were beneficial (see posts on main message board)