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Study of serum haptoglobin and its glycoforms in the diagnosis of hepatocellular carcinoma: a glycoproteomic approach.

Abstract：

:Increased serum haptoglobin concentration and changes in its glycosylation have been reported in certain cancer types. Information for hepatocellular carcinoma (HCC) has not yet been available. In this study, we aimed to carry out a systematic analysis of serum concentrations of haptoglobin (Hp) and its glycoforms in the patients with HCC and noncancer patients only with chronic liver diseases (CLD) and to examine their clinical values. This study was divided into two major parts, (1) measurement of serum Hp concentration, and investigation of its value in the diagnosis of HCC, and (2) quantitative analysis of Hp glycoforms with alpha-2,6-sialylation and/or alpha-1,6-fucosylation by using lectin affinity purification and 2D gel electrophoresis and investigation of their relationships with tumor stage. The concentrations of serum Hp in HCC patients were significantly higher than those in noncancer patients with CLD. With the use of serum concentrations of Hp and alpha-fetoprotein, a logistic regression (LR) model was developed from the training data set and used to classify the validation cases. At a specificity of 95%, the sensitivity for HCC detection was 79%. Comparing serum concentrations of alpha-2,6-sialylated Hp (S-Hp) and alpha-1,6-fucosylated Hp (F-Hp) between HCC and CLD patients suggests that purification of S-Hp and F-Hp could enrich the glycosylation variants associated with HCC. 2D gel analysis of S-Hp and F-Hp identified a total of 18 glycoforms. A unique pattern of Hp glycoforms comprising both hypersialylated fucosylated and hyposialylated fucosylated species was found in the HCC patients. Serum concentrations of these glycoproteins were significantly higher in the patients with advanced tumors, suggesting their tumor-specific nature. We have shown that serum Hp is a potential biomarker in the diagnosis of HCC. The combined use of Hp and AFP could greatly improve the diagnostic accuracy. A unique pattern of Hp glycoforms with altered sialylation and fucosylation is specific to HCC and associated tumor progression.

journal_name

J Proteome Res

journal_title

Journal of proteome research

authors

Ang IL,Poon TC,Lai PB,Chan AT,Ngai SM,Hui AY,Johnson PJ,Sung JJ

doi

10.1021/pr060109r

subject

Has Abstract

pub_date

2006-10-01 00:00:00

pages

2691-700

issue

10

eissn

1535-3893

issn

1535-3907

journal_volume

5

pub_type

杂志文章

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