Dec 5, 2012 12:23 PM by NBC News
The drug Tamoxifen has been extremely effective in reducing breast cancer deaths and new research reveals it could be more beneficial if it's taken for twice as long.
The "Atlas" study followed nearly 7,000 women who had completed the standard five years of Tamoxifen treatment for breast cancer.
Half of the group continued taking the drug for an additional five years while the others were told to stop.
The women who stayed on Tamoxifen had a lower recurrence rate and fewer of them died from breast cancer.
Tamoxifen does have potentially serious side effects but researchers say the benefits of extending its use seemed to outweigh the risks.
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