CEACAM5 and gallstones: We included age (≤58.5 vs. >58.5 years), size of gallstones (≤1.95 vs. >1.95 cm), course of gallstones (≤10 vs. >10 years), CEA (≤5 vs. >5 ng/ml), and CA199 (≤37 vs. >37 U/ml) were combined to establish three new combined predictive factors (CPF).