Popular cancer drug may have unexpected risk

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Tamoxifen is a hormone therapy that is one of the most common treatments for breast cancer.

But new research shows it can increase the risk of developing a second type of cancer in patients with the less common estrogen receptor negative breast cancer.

Researchers say patients should not stop taking the hormone therapy because of their study, because tamoxifen is still the most effective breast cancer treatment available.

The study will be published in Cancer Research.

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