Human breast cancer cell lines resistant to pure anti‐estrogens are sensitive to tamoxifen treatment

Abstract excerpt

The pure steroidal anti-estrogens ICI 164,384 and ICI 182,780 are very potent growth inhibitors of the estrogen receptor-positive human breast cancer cell line MCF-7. However, long-term treatment of MCF-7 cells with 10(-7) M concentrations of these compounds results in selection of proliferating colonies of resistant cells. Our report describes 4 ICI 164,384- and 3 ICI 182,780-resistant MCF-7 sublines established...

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