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A.J. Mast for The New York Times
Dr. David Flockhart discovered how the body converted the medication tamoxifen.
The Evidence Gap
The Genetic FactorArticles in this series are exploring medical treatments used despite scant proof that they work and are examining steps toward medicine based on evidence.
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Marissa Roth for The New York Times
After Jody Uslan had taken tamoxifen for more than two years, a genetic test suggested that it was not doing her any good.
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For more than two years, Jody Uslan had been taking the drug tamoxifen in hopes of preventing a recurrence of breast cancer. Then a new test suggested that because of her genetic makeup, the drug wa