Is zoladex (goserelin) effective for breast cancer?

Depends: Your physician may offer this as one of a variety of possible hormonal manipulations if and only if the pathology team says the tumor is hormone-sensitive. When it works, it is often strikingly successful.

Unknown: There is anecdotal data that ovarian suppression in the setting of estrogen positive breast cancer improves survival. These were small studies. Larger studies have not yet answered the question. Goserlin or equivalent medications provide ovarian suppression. Oophorectomy (removing the ovaries) does the same. But again, anecdotal. This needs to be discussed in advanced stage breast cancer patients.