The levels of the AICs (CIC, PrGIC, NGIC, and NSIC) were significantly higher than those of their free antigens (CYFRA21-1, ProGRP, NGAL, and NSE) in all participants (all p < 0.0001), HCs (p < 0.0001, p = 0.0027, p = 0.0198, and p < 0.0001, respectively) and patients with NSCLC (all p < 0.0001) (Figure S1). Here, GRP is linked to non-small cell lung carcinoma.