80 breast cancer patients and 30 normal patients with no known cancer history were enrolled in this study. All patients were female. The mean ages of cancer patients were 58.2 and 52.7 consecutively for cancer and non-cancer patients. The mean serum ATX levels of cancer and non-cancer patients were 1570.72 and 121.86 ng/mL consecutively (p=0.001). The cut-off value of ATX serum level was 178.49ng/mL according to the ROC analysis. The area under the ROC curve was 0.901showing that ATX is very efficient in distinguishing between two diagnostic groups (diseased/normal). ATX also showed good correlations with known tumor markers (CEA, CA15-3, CA125 levels). ATX levels were still higher than the cut-off value even in cancer patients with normal or low classical tumor marker levels.
