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The serum levels of carcinoembryonic antigen and carbohydrate antigen 19-9 were within the normal reference range.
[FIGURE 1 OMITTED] We used an antibody-based microarray system that quantitatively measures 11 common tumor makers [including carbohydrate antigen 19-9 (CA19-9),  CA15-3, CA242, CA125, carcinoembryonic antigen (CEA), [alpha]-fetoprotein (AFP), prostate-specific antigen (PSA), neuron-specific enolase (NSE), [beta] human chorionic gonadotropin ([beta]-HCG), cytokeratin 19 (CK19), and squamous cell carcinoma antigen (SCC)] in serum to test our design to alert for heterophilic antibody interference.
Elevated serum carbohydrate antigen 19-9 and CEA has been found to be elevated in signet-ring cell carcinoma in the past.
To the Editor: Imaging techniques, cytology, and biochemical analysis [including carcinoembryonic antigen (CEA)  and carbohydrate antigen 19-9 (CA 19-9) concentrations] of pancreatic cyst fluid obtained by endoscopic ultrasound-guided fine-needle aspiration are used to differentiate pancreatic cyst lesions, particularly those with malignant potential (1, 2).
2 mg/dL, and a carbohydrate antigen 19-9 (CA 19-9) level of 4,374 U/mL.