CEACAM5 and lung cancer: Then, binary logistic regression analyses were used to evaluate the superiority of HSP70 in lung cancer diagnosis; we found that even the combination of CEA and CA 19-9 is not higher than the individual diagnostic efficacy of HSP70 (0.898, 95% CI, 0.764–1.000; CEA + CA 19-9: 0.844, 95% CI, 0.687–1.000).