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TY - JOUR AU - Ma, Huiyan AU - Bernstein, Leslie AU - Pike, Malcolm C. AU - Ursin, Giske PY - 2006 DA - 2006/07/19 TI - Reproductive factors and breast cancer risk according to joint estrogen and progesterone receptor status: a meta-analysis of epidemiological studies JO - Breast Cancer Research SP - R43 VL - 8 IS - 4 AB - Although reproductive factors have been known for decades to be associated with breast cancer risk, it is unclear to what extent these associations differ by estrogen and progesterone receptor (ER/PR) status. This report presents the first meta-analysis of results from epidemiological studies that have investigated parity, age at first birth, breastfeeding, and age at menarche in relation to ER+PR+ and ER-PR- cancer risk. SN - 1465-542X UR - https://doi.org/10.1186/bcr1525 DO - 10.1186/bcr1525 ID - Ma2006 ER -