CEACAM5 and neoplasm: Subsequent tumor marker tests showed an AFP level of 1.91 ng/ml (reference range: 0–8.1 ng/ml), a CEA level below 0.5 ng/ml (reference range: 0–10 ng/ml), CA199 at 8.25 U/ml (reference range: 0–37 U/ml), CA72-4 at 13.24 U/ml (reference range: 0–6.9 U/ml), and a NSE level of 31.32 ng/ml (reference range: 0–15.2 ng/ml).