BACH1 and metastatic malignant neoplasm in the lymph nodes: The anti-BACH1 autoantibody level was significantly associated with lymph node metastasis (P = 0.0145) and the American Joint Committee on Cancer (AJCC) stage (P = 0.0012); however, there was no correlation with age, sex, histological grade, tumor location, tumor size, T stage or M stage (Supplementary Table S9).