Does taking Letrozole really help with HER2-positive breast cancer?

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It is not about HER-2. The real question is, is your breast cancer hormone receptor positive? If your breast cancer hormone receptor is positive, then letrozole helps. If not, then letrozole does not help. It is not about HER-2.
Yes. It is used to treat certain types of breast cancer (such as hormone-receptor-positive breast cancer) in women after menopause. Letrozole is also used to help prevent the cancer from returning. Some breast cancers are made to grow faster by a natural hormone called estrogen. Letrozole decreases the amount of estrogen the body makes and helps to slow or reverse the growth of these breast cancers.