Abstract
Background: Lung cancer screening is not limited to low dose computed tomography (LDCT). Recently, molecular biomarkers have been shown to have the potential to improve the current state of early lung cancer detection. The current study determined the efficiency of seven autoantibodies against tumor-associated antigens (7-AABs) and tumor markers in patients with lung cancer. Materials and Methods: An enzyme-linked immunosorbent assay (ELISA) was used to determine the levels of 7-AABs and tumor markers in 354 patients with lung cancer and 108 patients with benign pulmonary disease under care at Ethics Committee of Tianjin Medical University General Hospital. Results: The sensitivity, specificity, positive predictive value (PPV), and area under the receiver operating characteristic (ROC) curve of 7-AABs were 30.0%, 84.3%, 86.3%, and 0.61, respectively. When combining the 7-AABs and tumor markers, the sensitivity was 68.6%, the specificity was 52.8%, and the area under the ROC curve was 0.72. The 7-AABs positive expression rate in lung cancer patients was significantly higher than patients with benign pulmonary diseases (30.1% vs 15.7%); however, the 7-AABs positive expression rate was affected by clinical features and pathologic stages. When combining 7-AABs and tumor markers, the combined 7-AABs and tumor marker positive expression rate increased to 68.6%. Conclusion: Based on this study and previous literature, the supplemental diagnostic value of 7-AABs has been confirmed; however, due to the low sensitivity, the value of 7-AABs alone in lung cancer screening is limited. The combination of 7-AABs and tumor markers has improved sensitivity and positivity, but decreased specificity, which makes their performance in cancer screening and early detection worthy of further research.