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The reason doctors prefer Arimidex is that there are studies that prove that Arimidex works better than Tamoxifen head to head (ie: some women in the study took Taxoxifen and the others Arimidex).
Studies on the other 2 AIs (Femara and Aromosin) studied women who took 2 years of Tamoxifen and then half stayed on Tamoxifen and the other half were switched to Femara (another study switched half the women to Aromosin). These studies showed that the women who took 2 years of Tamoxifen then switched to an AI did better. Therefore, the other 2 were not proved (yet) to be better than Tamoxifen from the get go but were better than staying on Tamoxifen.
Femara also had another study that women who did their 5 years of Tamoxifen and then went on 5 years of Femara did better than women who did not (go on Femara after Tamoxifen).
This is the only reason doctors "like" Arimidex better (right now) and that's because of studies (Arimidex worked better without taking Tamoxifen first - however Femara and Aromosin studies will probably prove the same thing but doctors absolutely like proof - as we know LOL).
However, if Arimidex is giving you problems, I would definitely explore the others.
I got an oophorectomy in order to take Arimidex (along with adjuvant Herceptin).
Happy Holidays
Becky
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