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• W1973267030 endingPage "86" @default.
• W1973267030 startingPage "77" @default.
• W1973267030 abstract "The antiestrogen tamoxifen has been successfully used to control estrogen receptor (ER) and progesterone receptor positive breast cancer. However, the development of antiestrogen resistance is frequently observed in patients following long term treatment. We have studied the development of antiestrogen resistance in vitro and established an antiestrogen resistant variant of MCF-7 cells (clone 5C) after long term culture in estrogen free medium. The growth of clone 5C cells was not altered by either estradiol-17β or the antiestrogens 4-hydroxytamoxifen and ICI 164,384. Estrogen-stimulated progesterone receptor and reporter gene expression were markedly reduced in 5C cells compared to wild type MCF-7 cells. Only minor alteration in the levels of ER and no alteration in the affinity of ER for ligand were found in 5C cells. No mutation of ER cDNA in 5C cells was detected by polymerase chain reaction and DNA sequencing. This study demonstrates that change(s) in ER-mediated gene expression rather than the amino acid sequence of the ER itself may be associated with the development of at least one form of antiestrogen resistance." @default.
• W1973267030 created "2016-06-24" @default.
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• W1973267030 date "1992-12-01" @default.
• W1973267030 modified "2023-09-27" @default.
• W1973267030 title "An estrogen receptor positive MCF-7 clone that is resistant to antiestrogens and estradiol" @default.
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• W1973267030 doi "https://doi.org/10.1016/0303-7207(92)90104-e" @default.
• W1973267030 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/1301400" @default.
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