Source:http://linkedlifedata.com/resource/umls/id/C1522495
NCI: The first lymph node to which cancer is likely to spread from the primary tumor. Cancer cells may appear first in the sentinel node before spreading to other lymph nodes.,NCI: The first lymph node that is affected by cancer spread from the primary site. Sentinel lymph node biopsy is part of the staging work-up to determine early metastasis to regional lymph nodes in patients with breast carcinoma or melanoma.