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A pancreas cancer-associated antigen (PCAA) and a pancreas-specific antigen (PaA) were simultaneously quantitated by enzyme-linked immunosorbent assays in serum specimens from 51 normal controls, 76 pancreatic cancers, 194 nonpancreatic cancers, and 22 benign pancreatic diseases. Primary immunological reagents used in the enzyme-linked immunosorbent assays were our polyclonal antibodies produced in rabbits against purified PCAA and PaA. Results revealed discordance of these two markers in pancreatic cancer, suggesting that the presence of these two biochemically and immunologically distinct pancreas proteins in patients' serum may reflect different biological aspects of cancer. The combination test resulted in a better sensitivity and specificity for pancreatic cancer, 90 and 85%, respectively, than either PCAA or PaA assay alone. This study demonstrated that the combination of serum PCAA and PaA tests yields an additive clinical value and may be a useful adjunctive aid for the immunodiagnosis of the pancreatic cancer.
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