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Nowadays the term might refer to an inside-out Web called Worldbeam, a cell of terrorists, the sentinel nodes in an epidemic, an Internet project to feed poor people or the means to create cheap laptops for kids all over the world.
FORBES: Magazine Article
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If these first lymph nodes (sentinel lymph nodes) are cancer-free, there's a good chance that the melanoma has not spread beyond the area where it was first discovered.
CNN: Melanoma
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Cancer can still recur or spread, even if the sentinel lymph nodes are free of cancer.
CNN: Melanoma
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To determine whether your melanoma has spread to nearby lymph nodes, your surgeon may use a procedure known as a sentinel node biopsy.
CNN: Melanoma
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Sentinel node biopsy works on the principle that a few of the underarm nodes are first in line to host the spreading cancer cells.
BBC: 'One stop shop' for cancer