Mass spectrometric and linear discriminant analysis of N-glycans of human serum alpha-1-acid glycoprotein in cancer patients and healthy individuals.
N-glycan oligosaccharides of human serum alpha(1)-acid glycoprotein (AGP) samples isolated from 43 individuals (healthy individuals and patients with lymphoma and with ovarian tumor) were analyzed by MALDI-TOF mass spectrometry and a multivariate statistical method (linear discriminant analysis, LDA). 34 different glycan structures have been identified. From the glycosylation pattern determined by mass spectrometry fucosylation and branching indices have been calculated. These parameters show only small differences between the patient groups studied, but these differences are not sufficiently large to use as a potential biomarker. LDA analysis, on the other hand shows a very good separation between the three groups (with a classification of 88%). Cross-validation indicates that the method has predictive power: Identifying cancerous vs. healthy individuals shows 96% selectivity and 93% specificity; identification of lymphoma vs. the mixed group of healthy and ovarian tumor cases is also promising (72% selectivity and 84% specificity). The pilot study presented here demonstrates that mass spectrometry combined with linear discriminant analysis (LDA) may provide valuable data for identifying and studying the pathophysiology of malignant diseases.
Imre
Tímea
T
Institute of Structural Chemistry, Chemical Research Center, Hungarian Academy of Sciences, Budapest, Pusztaszeri u.59-67, Hungary.
Kremmer
Tibor
T
Héberger
Károly
K
Molnár-Szöllosi
Eva
E
Ludányi
Krisztina
K
Pócsfalvi
Gabriella
G
Malorni
Antonio
A
Drahos
László
L
Vékey
Károly
K
D014408:Biomarkers, Tumor; D016002:Discriminant Analysis; D005260:Female; D006031:Glycosylation; D006801:Humans; D008223:Lymphoma / Q000097:blood; D013058:Mass Spectrometry; D009961:Orosomucoid / Q000737:chemistry* / Q000378:metabolism; D010051:Ovarian Neoplasms / Q000097:blood; D011134:Polysaccharides / Q000737:chemistry*; D040901:Proteomics
D014408:Biomarkers, Tumor; D009961:Orosomucoid; D011134:Polysaccharides