p.s. I am very sorry it so long for anyone to give you a reply, but your question rolled over to the secong page before I saw it.
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Five years of tamoxifen treatment -- with or without chemotherapy -- cuts a woman's 15-year risk of breast cancer death by about a third.
The reassuring finding comes from analysis of long-term data on 21,457 women with breast cancer enrolled in clinical trials of tamoxifen.
One reason breast cancer is so deadly is that it often comes back after what a woman had hoped would be curative treatment. Tamoxifen reduces this risk.
It would be important to know if your cells were hormone receptor positive, however, because tamoxifen works only on the most common form of breast cancer, the form that needs the female hormone estrogen in order to grow. These cancers carry proteins, called receptors, that bind estrogen. Tamoxifen makes it impossible for these receptors to bind estrogen.
Since the surgeon/Cancer Center in Philadelphia recommended it for you, apparently it was felt that you would benefit from it. If you have any doubts about this, you should get back in touch with them.
Although tamoxifen, like all drugs, can cause side effects, most oncologists believe its benefit outweighs the risk, unless there is something in your personal medical hx that makes it contra-indicated.
Best wishes...