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The lymphatic fluid, that drains from
the tumor to the first lymph node and might carry tumor cells, is
stained by a blue dye and/or radioactive material, thus marking the
first lymph node (called sentinel node). In a small operation this node
will be identified, removed and examined. Theoretically all lymph nodes
should be free of tumor if the sentinel node doesn`t contain tumor
cells. In that cases removal of the lymph nodes could be spared
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