AFP and neoplasm: Besides, we didn’t detect any difference for serum tumor markers compromised alpha-fetoprotein (AFP), carcinoembryonic antigen (CEA), neuron-specific enolase (NSE), carbohydrate antigen 19–9 (CA19–9), carbohydrate antigen 12–5 (CA12–5) and carbohydrate antigen 15–3 (CA15–3) in between subjects with and without thyroid nodules (Table 6).