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Frequently, the use of the mycophenolic acid (MPA) meets limited by its regular digestive tolerance and serious infections.The MPAG is a molecule proceeding from the metabolism of the MPA that is excreted in the biliary route across the carrier MRP2, essential in the entero-hepatic circulation. There is controversy over the pharmacokinetic and clinical impact that could suppose the polymorphism MRP2 24 C>T in renal transplant recipients (RTR) on treatment with MPA.a) Principal: to investigate if MRP2C-24T polymorphism determines a higher risk for CMV infection or serious diarrhoea in RTR treated with micophenolate (MPA) and tacrolimus.b) Secondary: to evaluate if MRP2 C-24T polymorphism associates higher levels of MPA.The clinical data and banked DNA samples from patients transplanted between 2000 and 2005 were retrospectively studied (n=394). MPA blood concentrations were analysed to calculate the area under de curve in 118 patients. CMV infection and serious diarrhoea episodes were investigated during the follow up in patients treated with MPA and tacrolimus. T-student, log Rank and Cox regression were used for statistical analysis.a) CMV infection-free survival was lower in the group of patients carrying the MRP2 24C>T polymorphism (p=0.025).b) Diarrhoea free survival was lower in the group of patients carrying the MRP2 24C>T polymorphism (p=0.012).c) Multivariate analysis showed that MRP2 C-24T polymorphism, was an independent risk factors for CMV infection (HR: 1,938 IC95 1,150-3,043; p=0,013) and diarrhoea (HR: 2,598; IC95 1,070-6,380; p=0,044).d) Higher exposition of MPA was found in MRP2 C>T polymorphism carriers (AUC12h 76,88 vs 61,85 p 0.23); (AUC6-12h 26,79 vs 20,80 p 0.028).a) MRP2 C-24T polymorphism could be a risk factor for CMV infection and serious diarrhoea in RTRs treated with MPA.b) Carriers of this polymorphism associate higher MPA concentrations.