In multivariate Cox regression analysis by tumor size, lymph node metastasis and cIAP1+/ cIAP2+, the results revealed that cIAP1+/ cIAP2+ has a relative risk of 1.625 for OS, with P = 0.029 (Table 5). The gene discussed is BIRC2; the disease is metastatic malignant neoplasm in the lymph nodes.