Abstract:Background Estrogen receptor positive (ER+) progesterone receptor negative (PR-) tumors are a distinct subset of breast cancers that are not well characterized. It is critical to better understand the biology of ER+PR- tumors and tailor therapy accordingly for this unique subgroup. The objective of this study is to compare the ER+PR- subgroup of breast cancer as compared to the double positive ER+PR+ group in a large, well-characterized database to determine if the tumors that are PR- are associated with highe… Show more
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