The univariate analysis of the survival of patients with PMEC showed that gender, age, smoking history, and therapy had no significant influence on survival in patients with PMEC (p>0.05), but TNM stage, histological grade, lymph node metastasis, and MAML2 gene translocation did (p<0.05, <0.001, <0.001, <0.001). Here, MAML2 is linked to metastatic malignant neoplasm in the lymph nodes.