Outcomes of Estrogen Receptor Negative and Progesterone Receptor Positive Breast Cancer.

PLoS One · 2015 · PMC4498889 · PMID 26161666

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These data may explain why women with ER-negative and PgR-positive disease in the EBCTCG meta-analysis showed a trend towards initial benefit from adjuvant tamoxifen, an observation which was lost with longer follow-up.

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