Using tumor samples from wo-men with breast cancer, he used a gadget called a cell sorter to sift through dozens of different proteins on the surface of breast cancer cells, searching for patterns that might identify stem cells.

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It's a variation on the well-established breast cancer drug Taxol, which works by inhibiting cell division.

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"When it comes to breast cancer risks, the extra fat in obesity leads to extra estrogen production, which can lead to extra breast cell growth, including abnormal breast cell growths, " she said.

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Happily, hair dye and cell phone radiation are not likely connected to breast cancer, the IOM team repots.

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The cancer, anaplastic large cell lymphoma occurs in the breast occurs in three out of every 100 million women per year worldwide.

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That is embarrassing for breast-cancer activists, who have campaigned hard for autologous stem-cell support to be made more widely available.

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The expert group did find an increased risk of one extremely rare cancer - anaplastic large cell lymphoma (ALCL) from all breast implants.

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