CEACAM5 and cancer: However, Cox multivariate analysis importantly showed that CA19-9 positivity (>37 U/mL), but not CEA (>5.0 ng/mL) positivity, was an exclusive independent prognostic factor for cancer-specific survival (multivariate HR = 3.89, 95% CI 1.41–10.33; P = 0.010) and overall survival (multivariate HR = 2.43, 95% CI 1.03–5.35; P = 0.043) (Table3).