Researchers at Georgetown Lombardi Comprehensive Cancer Center say the number of circulating tumor cells (CTCs) in the blood is a "powerful predictor" to help physicians more reliably assess treatment benefit for patients with metastatic breast cancer. The findings from a large analysis using pooled data from international cancer centers will be presented during a poster session on Monday, June 6th, at the 2011 annual meeting of the American Society of Clinical Oncology in Chicago... 
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