Trastuzumab With or Without Tamoxifen in Treating Women With Progressive Stage IV Breast Cancer

Summary

RATIONALE: Monoclonal antibodies such as trastuzumab can locate tumor cells and either kill them or deliver tumor-killing substances to them without harming normal cells. Estrogen can stimulate the growth of breast cancer cells. Hormone therapy using tamoxifen may fight breast cancer by blocking the uptake of estrogen. Combining trastuzumab with tamoxifen may kill more tumor cells. PURPOSE: Randomized phase III trial to compare the effectiveness of trastuzumab with or without trastuzumab in treating women who have invasive stage IV breast cancer.

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