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Removal and examination of the sentinel node(s) (the first lymph node(s) to which cancer
cells are likely to spread from a primary tumor). To identify the sentinel lymph node(s), the
surgeon injects a radioactive substance, blue dye, or both near the tumor. The surgeon then uses
a probe to find the sentinel lymph node(s) containing the radioactive substance or looks for the
lymph node(s) stained with dye. The surgeon then removes the sentinel node(s) to check for the
presence of cancer cells.