Her2+/Er+ may still be enhanced by soy, despite media mentioning a reversal on this. It may be true for Her2-.
also..coffee, even decaf, seems to be estrogenic.
You can use Stevia, a natural sugar substitute with anticancer properties, as a sweetener.
Are you saying you had a positive biopsy in both breasts? have they consiederd neoadjuvant (presurgery) treatment with Herceptin and/or endocrine therapy?
If you are destined for general anesthesia, run this by the surgeon:
http://her2support.org/vbulletin/showthread.php?t=42074