More women with breast cancer will be switched from tamoxifen to one of the aromatase inhibitors

More women with breast cancer will be switched from tamoxifen to one of the aromatase inhibitors... Arimidex, Femara, or Aromasin.

These drugs seem more effective for preventing recurrence in postmenopausal women with estrogen-receptor positive breast cancer.

Tamoxifen blocks estrogen receptors...but tumors can become resistant to its effects.

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