Q. I’ve been diagnosed with ER-receptive breast cancer, and once I finish chemo my doctor is considering two hormone drugs: tamoxifen, and Zoladex. I know all about tamoxifen, but what’s Zoladex?    

A. Zoladex (goserelin) and Lupron (leuprolide) are both drugs that prevent your brain from sending signals to your ovaries telling them to make estrogen. (This is called ovarian function suppression, or OFS; and the drugs themselves are called gonadotropin releasing hormones, GnRH, should you...