Background/aim: Few data are available regarding the clinical performance of LOCI™-based tumor marker assays. We investigated the diagnostic power of carcinogenic antigen, carbohydrate antigen 19-9, carbohydrate antigen 15-3, carbohydrate antigen 125 and alpha-fetoprotein for detection of gastrointestinal (GI) cancer.
Patients And Methods: We analyzed sera from 204 patients (107 with GI cancer, 73 with benign GI diseases and 24 healthy controls) using the Dimension™ Vista1500 analyzer.
Results: Levels of biomarkers in healthy controls were in the expected ranges and were only slightly higher in benign GI controls. Established tumor-type-associated markers were elevated in specific cancer types and discriminated well between cancer and benign controls. Best performance was found for CEA in colorectal cancer (area under the curve=0.84, sensitivity=51.7% at 95% specificity vs. benign), CA19-9 in gallbladder/pancreatic cancer (AUC=0.85, sensitivity=60.6%) and AFP in liver cancer (AUC=0.87, sensitivity=68.4%).
Conclusion: Our study demonstrated the high diagnostic power of well-known biomarkers. LOCI™-based tumor marker assays give reliable results in routine diagnostics.
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