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KMID : 1101320090410040167
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Korean Journal of Clinical Laboratory Science
2009 Volume.41 No. 4 p.167 ~ p.172
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Quantitative Analysis of Methotrexate using Hitach-7600 P-module
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Kim Min-Eui
Cha Kyong-Ho
Kim Seung-Hee
Kim Nam-Joo
Chae Hyo-Jin
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Abstract
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Methotrexate (MTX) in one of the antineoplastic drug and it is known to effective to management of acute lymphoblastic leukemia in children, management of choriocarcinoma and related trophoblastic tumors in women, management of carcinomas of the breast, tongue, pharynx, and tests, maintenance of remission in leukemia and treatment of serve, debilitating psoriasis. Intermediate to high-dose methotrexate administration followed by leucovorin rescue is effective in treatment of carcinoma of the lung and osteogenic sarcoma. Intrathecal administration is effective in treating meningeal leukemia or lymphoma. There are FPIA (Fluorescence polarization immunoassay) and EMIT (Enzyme multiplied immunotechique) methods that measure for MTX. We evaluated the FPIA and EMIT methods. MTX were measured by Hitachi-7600 P-module using EMIT and FPIA using TDX in the sera 60 patients. The performance characteristics evaluated were, light influence, linearity, comparison with FPIA. Also, precision evaluated were three level controls through put following CLSI evaluation protocols (EP10-A). When the MTX value of 4.16±5.78 μμmol/L (mean, SD) by the Hitachi-7600 P-module was compared with that of 4.05±5.47 μμ mol/L by FPIA, coefficients of correlation of 0.988 was obtained. The regression equation was Y (Hitachi-7600 P-module) = 0.9408 x (FPIA) + 0.1316 (r=0.9885, n=60). CVs of MTX measured by Hitachi 7600 P-module was 6.78% at 0.33 μμmol/L, 0.96% at 1.16 μμmol/L, and 0.96% at 8.04 μμmol/L. The precision was excellent in each group. The linearity was acceptable. We evaluated that MTX is light-sensitive on prolonged exposure to direct sunlight. Comparing with the FPIA using TDX, the Hitachi-7600 P-module using EMIT showed good coefficient of correlation and precision. Therefore the Hitachi-7600 P-module can replace the FPIA for quantitative analysis of MTX.
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KEYWORD
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Methotrexate, Quantitative analysis, Hitachi-7600 P-module, FPIA, EMIT, Antineoplastic drug
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