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just to confuse things more I found the following which would infer
Tamoxifen may prevent both ER+ and ER- breast cancers and select for ER- carcinogenesis: an alternative hypothesis.
Breast Cancer Res. 2005;7(6):R1153-8. Epub 2005 Nov 21.
PMID: 16457695 [PubMed - indexed for MEDLINE]
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