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HER-2/neu overexpression has been associated with poor prognosis in human breast cancer. Many of these cancers are also ER-positive. A logical therapeutic approach for patients who are ER-positive and overexpress HER-2/neu may be to block both the ER and the HER-2/neu pathways. In our study, we used both the MTT tetrazolium dye assay and 3H-thymidine incorporation to measure the effects of the anti-estrogen...