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  • Title: Reliability of mycophenolic acid monitoring by an enzyme multiplied immunoassay technique.
    Author: Martiny D, Macours P, Cotton F, Thiry P, Gulbis B.
    Journal: Clin Lab; 2010; 56(7-8):345-53. PubMed ID: 20857899.
    Abstract:
    BACKGROUND: For mycophenolic acid (MPA), substantial inter- and intra-individual variability and drug interactions have been observed and therapeutic drug monitoring is now recommended. In this study, a MPA commercial Enzyme Multiplied Immunoassay Technique (EMIT) was evaluated and compared with the HPLC-UV reference method which is easily practicable in a routine laboratory. METHODS: Plasma samples (n = 117) were collected from adult renal graft patients treated by mycophenolate in combination with either cyclosporin A (CyA) (n = 32) or tacrolimus (n = 85). RESULTS: Considering all samples, correlation was excellent (p < 0.0001). However, significant MPA overestimation was observed with EMIT in the early post-transplant period (30%, n = 32) or when combined with cyclosporin (45%). CONCLUSIONS: In the early post-transplant period, or in cases where CyA is used in combination with MPA, the EMIT cannot be recommended. HPLC or LC/MS are here the method of choice.
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