Nevertheless, there was no association between Claudin‐1 and other clinical features, namely age (p = 0.96), sex (p = 0.54), tissue type (p = 0.93), histological differentiation (p = 0.31), lymph node metastasis (p = 0.06), and distant metastasis (p = 0.87). Here, CLDN7 is linked to metastatic malignant neoplasm in the lymph nodes.