ENO2 and metastatic malignant neoplasm in the lymph nodes: The higher numbers of CTC were observed in patients with old age (≥62 years), lymph node metastasis (N1-3), distant metastasis (M1), III/IV stage of TNM, and high expression of NSE (>25 ng/ml), while the numbers of CTC were lower in patients with young age (≤61 years), without lymph node metastasis (N0), without distant metastasis (M0), I/II stage of TNM and low expression of NSE (≤25 ng/ml).