ENO2 and animal viral hepatitis: Eleven (5.2%) patients had viral hepatitis, including hepatitis B (n = 10) and C (n = 1); 25 (11.8%) had altered tumor markers, including CA199 (n = 8), CA724 (n = 5), CA242 (n = 1), CA125 (n = 5), and neuron-specific enolase (n = 6), but none of them exceeded three times the normal value.