CP and Behcet disease: CEACAM 1 values in PDAC were not elevated compared with patients with CP, but were higher compared to BD (PDAC median 33.0 μg/l, range 3.3–136.7 μg/l; CP median 23.1 μg/l, range 1.8–110.1; BD median 16.1 μg/l, range 7.8–36.5 μg/l; P = 0.059 and P<0.001, respectively).