OGDH and primary biliary cholangitis: The target autoantigens in PBC patient sera have been identified as the E2 subunits of the pyruvate dehydrogenase complex (PDC-E2), the branched-chain 2-oxo-acid dehydrogenase complex (BCOADC-E2), and the 2-oxoglutarate dehydrogenase complex (OGDC-E2) [4, 5].