Interestingly, the expression level of KK-LC-1 in 19 LUAD patients’ serum was significantly decreased than that in patients after operation (Fig. 2D), and KK-LC-1 had a good ability to discriminate distinguish preoperative LUAD cancer patients from and postoperative patients with an AUC of 0.720 (Fig. 2E). Here, CT83 is linked to cancer.