UNITED STATES - JANUARY 22: Breast cancer treatment Tamoxifen is arranged for an illustration at Skenderian Apothecary in Cambridge, Massachusetts, Monday, Jan. 22, 2007. Patients discontinue use of tamoxifen, the most widely prescribed breast cancer drug, about twice as often as doctors thought, leading to more relapses and deaths, a study suggests. (Photo by Jb Reed/Bloomberg via Getty Images)
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