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Tamoxifen is one of the standards of care following chemo or radiation.  My guess is that you were given it because of your hormone status.  There are a few other drugs he could give, but the data and research does not match that of Tamoxifen - plus they all carry nearly the same side effects.  You're probably better off asking your oncologist directly why he chose this particular drug - but if you're hormone positive you will need to take something to prevent your estrogen from binding with the cancer calls which makes them grow.  Even if you are postmenopausal you still secrete estrogen from other glands.  I hope that helps you understand a bit, but to truly understand you will need to ask your doctor. Good luck finding out! Angi