the most common type being oral squamous cell carcinoma (OSCC). OSCC may arise in any part of the oral cavity, including the tongue, gingiva, hard palate, buccal mucosa, and floor of the mouth. The most frequent location of occurrence is the tongue, followed by the lower gingiva and the floor of the mouth (1). Important clinical factors in the evaluation of tumor progression are primary tumor size, cervical lymph node metastasis, and distant metastasis. Therefore, the tumor/node/metastasis (TNM) classification of the Union for International Cancer Control (UICC) is used to determine treatment regimens for oral cancer. Among them, cervical lymph node metastasis is one of the important factors affecting the prognosis of patients. OSCC often metastasizes to the cervical lymph nodes (CLN). CLN are removed by cervical dissection, and the levels, number of metastases, size, and extracapsular nodule infiltration of lymph nodes are recorded as histopathological findings (2). However, evaluation by immunohistochemical staining has not been performed.