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QS21: A plant extract that may improve the ability of the immune system to respond to disease. It is being studied in combination with vaccine therapy. quadrantectomy: Surgical removal of the region of the breast (approximately one quarter) containing cancer. quality of life: The overall enjoyment
of life. Many clinical trials measure htmlects of an individual's sense of
well-being and ability to perform various tasks to assess the effects of cancer
and its treatment on the quality of life.
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