The T/N ratio of the APOBEC3B/β-actin mRNA level was not significantly different in lymph node metastasis (3.871±5.546) and the lymph node metastasis-negative cases (4.278±8.416, P=0.9462) (Table I). This evidence concerns the gene APOBEC3B and metastatic malignant neoplasm in the lymph nodes.