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It seems the article is based on taking Tamoxifen to prevent the occurance of breast cancer if you are in a high risk group. It is not about preventing recurrence which is different. Studies undoubtedly show that Tamoxifen reduces the risk of recurrence by almost 50% (I think the actual number is 46%).
Herceptin does the same if Her2+ and was groundbreaking last year at ASCO. Tamoxifen also was groundbreaking at the time and still is. Whether it greatly reduces the chance of getting bc - I can't say.
Becky
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