ELISA analysis of CHI3L1 protein in serum of human lung cancer patients.

Top: CHI3L1 protein concentrations in human serum. Bottom: ROC (Receiver Operating Characteristic) curve analysis to determine the area under the curve (AUC). Mean ± SD in control (n>30): 17.3±7.8. Mean ± SD in adenocarcinoma (n>30): 66.9±64.8. Mean ± SD in squamous carcinoma (n>30): 69.3±69.0. Mean ± SD in small cell cancer (n>30): 56.3±58.8. The gray lines represent the mean values. Control: Normal human without cancer.