CEACAM5 and neoplasm: There was no significant difference in serum tumor marker levels between wild-type and mutant EGFR (7.3 ng/ml vs 2.5 ng/ml for s-CYFRA, 18.8 ng/ml vs 34.6 ng/ml for s-CEA, and 1.0 ng/ml vs 0.8 ng/ml for s-SCCA).