Longer survival time was found to be significantly correlated with the following factors: low TNM stag (p = 0.0005), no lymph node metastasis (mean survival time, 41.04 months vs. 31.25 months, p = 0.0051), low level of MVD (mean survival time, 39.96 months vs 31.85 months, p = 0.0434), and PlGF low-level expression (mean survival time, 40.68 months vs 27.76 months, p = 0.0028). The gene discussed is PGF; the disease is metastatic malignant neoplasm in the lymph nodes.