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Currently, there is a trial comparing the three aromatase inhibitors (Femara, Arimidex, and Aromosin). My cousin (who is only ER/PR pos but not Her2) is on it and is in the Arimidex arm.
Theoretically, there should be no difference but at ASCO this year, there was a poster comparing the 3 drugs with women with mets (can't remember the location of the mets or if it was just mets in general) but that study did show that Femara was slightly better (but I believe it was not statistically better).
Becky
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