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- W2008022352 abstract "Proliferating cells express the pyruvate kinase isoenzyme type M2 (M2-PK). This enzyme exists as an active tetramer and an inactive dimer. The dimeric form is predominantly found in tumor cells and is therefore termed Tumor M2-PK (TuM2-PK). TuM2-PK molecules are released into the peripheral blood and may hereby function as a marker of tumor load in cancer patients. Our study was aimed to investigate TuM2-PK as a potential plasma marker in melanoma patients compared to the well-established serum marker S100beta. We measured the concentration of TuM2-PK in plasma and S100beta in corresponding serum samples from 300 melanoma patients and 53 healthy controls using a sandwich ELISA and an immunoluminometric assay, respectively. Plasma concentrations of TuM2-PK were significantly increased in melanoma patients compared to healthy controls (9.30 U/ml vs. 7.20 U/ml; p = 0.0036) and correlated with tumor load (p < 0.0005) and disease stage (p < 0.0005). Patients with elevated plasma TuM2-PK (cut-off = 15 U/ml) presented a reduced overall (p < 0.000005) and progression-free (p = 0.023) survival. Multivariate analysis revealed plasma TuM2-PK and serum S100beta as independent predictors of overall survival in metastasized patients. Neither plasma TuM2-PK nor serum S100beta showed prognostic relevance for tumor-free patients. Although the sensitivity and specificity to predict disease progression or death was higher for serum S100beta compared to plasma TuM2-PK, the combination of both markers improved the estimation of prognosis compared to that of serum S100beta alone." @default.
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- W2008022352 date "2005-06-14" @default.
- W2008022352 modified "2023-10-10" @default.
- W2008022352 title "Tumor type M2 pyruvate kinase (TuM2-PK) as a novel plasma tumor marker in melanoma" @default.
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- W2008022352 doi "https://doi.org/10.1002/ijc.21073" @default.
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