Any woman in either group who develops breast cancer is treated to the fullest extent possible, following the closest possible treatment plan to other participants in the trial (taking into consideration the stage of the disease at diagnosis). Researchers follow the women’s progress over many years, with the goal of comparing the two groups’ mortality rates.
两组中所有患乳腺癌的女性均按照与其他受试者最为贴近的治疗计划（考虑到诊断时乳腺癌所处的阶段）接受最积极的治疗。研究人员长期跟踪这些受试者的状况，目的是对这两组的死亡率进行比较。