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Word Count: 205
US scientists have discovered that breast cancer has a deadly migration path to the lungs and bone marrow The reason for cancer cells choosing major organs has always puzzled scientists Scientists have discovered that the answer lies in molecules called chemokines that carry messages between cells This is the first very clear concept that provides a reason for why tumors reside in certain places Dr Jonathon Sedgwick the director of the immunology unit said in a telephone interview Chemokines are found in tissues such as the lung and lymph nodes and act as traffic policemen telling cells where to go The more Chemokines in a certain organ the more likely a cancer cell is to metastasize into that organ After their research they tried to figure out a way to block out the metastasis of the breast cancer cells into other organs To do this they injected breast cancer cells into mice in an effort to try to discover how to block the cells from metastasizing They then in jected the mice with antibodies that blocked the receptor from binding with the chemokine preventing the metastasis The scientists hope that their research in mice will eventually lead to further research in humans
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