MUC4 and pancreatic neoplasm: Therefore, to provide antibody-defined units for MUC4 and MUC5AC and promote biomarker research for pancreatic cancer, we have produced a new standard/calibrator material that will be used to provide “standardized” MUC5AC and MUC4 units in relation to the established CA19-9 units, for which secondary standards/calibrators can be obtained (i.e., from Beckman Coulter, Fujirebio Diagnostics, or Roche Diagnostics).