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NCI Dictionary of Cancer Terms

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4-hydroxytamoxifen  listen  (4-hy-DROK-see-tuh-MOK-sih-FEN)

  A form of the drug tamoxifen that is made by the body after taking tamoxifen. It can also be made in the laboratory, and may help decrease breast density. A topical form of 4-hydroxytamoxifen is being studied in breast cancer screening.