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Meta‐analysis of the impact of progesterone receptor status on oncological outcomes in oestrogen receptor‐positive breast cancer

Assessment of the oestrogen receptor (ER) provides important prognostic information in breast cancer. The impact of progesterone receptor (PgR) status is less clear. Standardization of immunohistochemical analysis of these receptors has reduced interstudy heterogeneity. The aim of this meta‐analysis was to evaluate the impact of PgR negativity on outcomes in ER‐positive (ER+) breast cancer.