ERBB2 and primary biliary cholangitis: For serum HER2, no significant difference was observed between the healthy individuals and PBC patients (median 12.2 ng/ml, range 7.8 to 20.9 ng/ml and median 12.5 ng/ml, range 6.9 to 122.2 ng/ml, respectively; U = 2,383.5, P = 0.511).