Abstract
Background
This study aimed to evaluate the quantitative measurement of Mac-2 binding protein glycosylation isomer (M2BPGi) levels using the new chemiluminescent enzyme immunoassay.
Methods
The data of a total of 347 patients with hepatitis C virus (HCV) infection and 150 health volunteers from 13 locations in Japan were evaluated. The quantitative system for measuring M2BPGi-Qt levels was based on a new chemiluminescent enzyme immunoassay. We evaluated the reproducibility and quantitation range in quantitative M2BPGi-Qt measurement. We also investigated the confidence ratio of M2BPGi-Qt levels measured by the new quantitative system to M2BPGi levels measured by the current semi-quantitative system for validating the clinical utility of the new method.
Results
The reproducibility of M2BPGi-Qt in HCV samples with negative, positive 1+, and positive 2+ was 0.77 ± 0.02 AU/mL, 2.25 ± 0.03 AU/mL, and 6.55 ± 0.21 AU/mL, respectively, and the corresponding coefficient of variation (CV)s were 2.1%, 1.3%, and 3.2%, respectively. The range of quantification assessment resulted that all CVs showed less than 5% in investigated range. Sample stability testing found that the mean percentage difference between the pre- and post-storage values of 6 samples ranged between 96.2 and 103.9%. The correlation coefficient between M2BPGi and M2BPGi-Qt in patients with HCV and the healthy volunteers was 0.986 and 0.991, respectively. M2BPGi-Qt could be quantitatively assessed in a patient with over 20 C.O.I.
Conclusion
Compared with qualitative methods, the M2BPGi quantitative measurement system could provide a numerical value unaffected by interpretation bias, and measurements are more precise at high M2BPGi levels.
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Acknowledgements
We thank the SATISTA Corporation for assistance with the statistical analyses.
Funding
This study was supported by Sysmex Corporation.
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NK and MK collected and analyzed the data; HU and MM drafted the manuscript; M K designed and supervised the study; KY, MS, KS offered technical or material support; all authors have read and approved the final version to be published.
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Takeji Umemura received a lecture fee from AbbVie GK, Gilead Sciences and and a research grant from AbbVie GK, Eisai Co., Otsuka Pharmaceutical Co., Tosoh Co. Masayuki Kurosaki received a lecture fee from AbbVie, Eisai, Chugai, AstraZeneca, Lilly, Takeda Co. Masashi Mizokami received a lecture fee from Sysmec Co. Yasuhiro Asahina received a lecture fee from Fujirebi Inc, Abbott Japan LLC. Takumi Kawaguchi received lecture fees from Taisho Pharmaceutical Co., Kowa Company., Otsuka Pharmaceutical Co., Eisai Co., Janssen Pharmaceutical K.K., AbbVie GK., ASKA Pharmaceutical Co., EA Pharma Co. and a research grant from Eisai Co., Ltd.
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Uojima, H., Nakabayashi, K., Yamasaki, K. et al. New chemiluminescent enzyme immunoassay for quantitative measurement of Mac-2 binding protein glycosylation isomer in chronic liver disease. J Gastroenterol 58, 1252–1260 (2023). https://doi.org/10.1007/s00535-023-02043-1
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DOI: https://doi.org/10.1007/s00535-023-02043-1