8 research outputs found
Optimizing Surveillance Performance of Alpha-Fetoprotein by Selection of Proper Target Population in Chronic Hepatitis B
<div><p>Although alpha-fetoprotein (AFP) is the most widely used biomarker in hepatocellular carcinoma (HCC) surveillance, disease activity may also increase AFP levels in chronic hepatitis B (CHB). Since nucleos(t)ide analog (NA) therapy may reduce not only HBV viral loads and transaminase levels but also the falsely elevated AFP levels in CHB, we tried to determine whether exposure to NA therapy influences AFP performance and whether selective application can optimize the performance of AFP testing in CHB during HCC surveillance. A retrospective cohort of 6,453 CHB patients who received HCC surveillance was constructed from the electronic clinical data warehouse. Covariates of AFP elevation were determined from 53,137 AFP measurements, and covariate-specific receiver operating characteristics regression analysis revealed that albumin levels and exposure to NA therapy were independent determinants of AFP performance. C statistics were largest in patients with albumin levels ≥ 3.7 g/dL who were followed without NA therapy during study period, whereas AFP performance was poorest when tested in patients with NA therapy during study and albumin levels were < 3.7 g/dL (difference in C statics = 0.35, p < 0.0001). Contrary to expectation, CHB patients with current or recent exposure to NA therapy showed poorer performance of AFP during HCC surveillance. Combination of concomitant albumin levels and status of NA therapy can identify subgroup of CHB patients who will show optimized AFP performance.</p></div
Sensitivity and specificity of AFP according to concomitant albumin levels and NA therapy.
<p>Sensitivity and specificity of AFP according to concomitant albumin levels and NA therapy.</p
Receiver operating characteristic curves of AFP according to NA therapy status and concomitant albumin levels.
<p>The C statistics with 95% confidence interval are presented in brackets. AFP tests showed best performance in patients without NA therapy during study period and when concomitantly measured albumin levels were ≥ 3.7 g/dL. In contrast, the C statistics were lowest in patients who received NA therapy during study period and when concomitantly measured albumin levels were < 3.7 g/dL.</p
Covariate-adjusted ROC regression analysis of AFP for HCC surveillance.
<p>Covariate-adjusted ROC regression analysis of AFP for HCC surveillance.</p
Comparison of C statistics of AFP measurements according to covariates of AFP elevation and baseline AFP levels.
<p>Comparison of C statistics of AFP measurements according to covariates of AFP elevation and baseline AFP levels.</p
Multivariate logistic regression model for covariates of elevated AFP levels (> 10 ng/mL) during HCC surveillance.
<p>Multivariate logistic regression model for covariates of elevated AFP levels (> 10 ng/mL) during HCC surveillance.</p
Baseline clinical and laboratory parameters in patients with or without subsequent HCC development during the surveillance period.
<p>Baseline clinical and laboratory parameters in patients with or without subsequent HCC development during the surveillance period.</p