Cancer researchers at the Kimmel Cancer Center at Jefferson and an international team of collaborators have discovered a biomarker in breast cancer that may help identify which women will respond to anti-estrogen therapy. The research appears in the May 16 online issue of the Journal of Clinical Oncology. Anti-estrogen drugs, most notably tamoxifen, are widely used in patients diagnosed with estrogen receptor-positive breast cancer. However, as many as a third of the women given tamoxifen fail to respond... 
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