Comparison of HPLC and small column (CDTect) methods for disialotransferrin

Area of Science:

• Clinical Chemistry
• Biomarker Analysis
• Analytical Chemistry

Background:

• Carbohydrate-deficient transferrin (CDT) is a key biomarker for chronic alcohol abuse.
• Current CDT determination methods include ion-exchange chromatography with immunoassay or HPLC with absorbance detection.
• HPLC methods show potential for improved accuracy in CDT assessment.

Purpose of the Study:

• To evaluate the efficacy of HPLC anion-exchange chromatography for quantifying CDT.
• To compare the diagnostic performance of HPLC with a commercial CDTect assay.
• To assess the utility of CDT as a marker differentiating alcohol consumption levels.

Main Methods:

• HPLC using MonoQ or ResourceQ anion-exchange columns for transferrin isoform separation.
• Quantification of the disialo form of transferrin (DST) as a measure of CDT.
• Analysis of serum samples from nondrinkers, moderate drinkers, and heavy drinkers.
• Comparison with the commercial CDTect assay using Receiver Operating Characteristic (ROC) analysis.

Main Results:

• HPLC demonstrated a significantly higher area under the curve (AUC) of 0.87 compared to CDTect's 0.72 for differentiating moderate from heavy drinkers.
• At 90% specificity, HPLC achieved 63% sensitivity, substantially outperforming CDTect's 33% sensitivity.
• The established reference interval for the HPLC method was 0.68-1.7%.

Conclusions:

• HPLC anion-exchange chromatography provides superior separation and quantification of CDT.
• The HPLC method offers enhanced diagnostic accuracy for distinguishing between moderate and heavy alcohol consumption.
• This HPLC approach validates CDT as a more effective biomarker for chronic alcohol abuse detection.