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Diagnosis and Monitoring of Colorectal Cancer by L6 Blood Serum Polymerase Chain Reaction Is Superior to Carcinoembryonic Antigen–Enzyme-Linked Immunosorbent Assay

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Diseases of the Colon & Rectum

Abstract

PURPOSE: The aim of this study was to compare carcinoembryonic antigen levels with detection of messenger ribonucleic acid coding for the tumor-associated antigen L6 in patients with colorectal cancer. Not only are carcinoembryonic antigens expressed by the corresponding tumor cell, but the messenger ribonucleic acid of tumor-associated antigens, in contrast, is produced exclusively by viable tumor cells. METHODS: L6 messenger ribonucleic acid was determined by reverse-transcription polymerase chain reaction. Carcinoembryonic antigen was measured by the enzyme-linked immunosorbent assay technique, with a cutoff value of 40 μg/l. Blood serum was sampled from 187 patients with colorectal cancer. Statistical significance was calculated with the McNemar chi-squared test. RESULTS: Preoperatively, 79 percent of patients in all stages were positive for L6 messenger ribonucleic acid, whereas only 35 percent had elevated carcinoembryonic antigen titers (P < 0.001). In Dukes A tumors, 84.9 percent of patients were positive for L6 messenger ribonucleic acid, whereas carcinoembryonic antigen was elevated in only 16.9 percent of patients. Only in Dukes D tumors did the enzyme-linked immunosorbent assay for carcinoembryonic antigen exhibit the same sensitivity as reverse-transcription polymerase chain reaction for L6 messenger ribonucleic acid. Recurrence was detected significantly earlier by reverse-transcription polymerase chain reaction for L6 messenger ribonucleic acid than by enzyme-linked immunosorbent assay for carcinoembryonic antigen. CONCLUSION: L6 is more sensitive and precise than carcinoembryonic antigen in diagnosing and monitoring colorectal cancer.

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Schiedeck, T.H., Wellm, C., Roblick, U.J. et al. Diagnosis and Monitoring of Colorectal Cancer by L6 Blood Serum Polymerase Chain Reaction Is Superior to Carcinoembryonic Antigen–Enzyme-Linked Immunosorbent Assay. Dis Colon Rectum 46, 818–825 (2003). https://doi.org/10.1007/s10350-004-6662-6

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  • DOI: https://doi.org/10.1007/s10350-004-6662-6

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