Besides, the expression of ABCG2 is correlated with lymph node metastasis (p = 0.049) and clinical stage (p = 0.015), which suggests that the patients with high expression of ABCG2 may have a worse prognosis than those with low expression of ABCG2. Here, ABCG2 is linked to metastatic malignant neoplasm in the lymph nodes.