More women with breast cancer will be switched from tamoxifen to an aromatase inhibitor

More women with breast cancer will be switched from tamoxifen to an aromatase inhibitor...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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