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IHC = immunohistochemistry; RT-PCR = reverse transcription-polymerase chain reaction; CK = cytokeratin; CEA = carcinoembryonic antigen; MAGE = melanoma-associated gene; MUC = mucin gene; TEF = transcription enhance factor. *This refers to the incidence of lymph node micrometastasis in patients who were diagnosed with pN0 via conventional pathologic examination.
