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Breast Cancer

Estrogen receptor level predicts tamoxifen resistance in breast cancer

Published in Vaccine Weekly, November 17th, 2004

Estrogen receptor beta (ERbeta) level but not its ERbetacx variant helps to predict tamoxifen resistance in breast cancer.

"The anti-estrogen tamoxifen, a major endocrine therapy of estrogen receptor (ER)-positive breast cancer, is nevertheless inefficient in 30 to 40% of cases for unknown reasons. We retrospectively studied 50 ER-positive primary breast carcinomas. All of the patients had received tamoxifen as the only adjuvant therapy. They were divided into two groups depending on whether they relapsed within 5 years (16 tamoxifen-resistant cases) or did not relapse within 5 years (34 tamoxifen-sensitive cases)," scientists in France and Sweden report.

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