Tumors biopsied from women with invasive breast cancer are having their genomes sequenced in an attempt to develop a DNA profile that one day may identify ahead of time the patients who will most likely respond to chemotherapy with an aromatase inhibitor. Aromatase inhibitors are a class of chemotherapeutic agents that block the production of estrogen in postmenopausal women. The genetic profiling is part of an ongoing clinical trial of more than 300 postmenopausal women who had estrogen-positive stage II or III breast cancer at the time of diagnosis... 
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