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Daleboudt GMN, Reinders MEJ, Hartigh JD, Huizinga TWJ, Rabelink AJ, de Fijter JW, Berger SP. Concentration-controlled treatment of lupus nephritis with mycophenolate mofetil. Lupus 2012; 22:171-9. [DOI: 10.1177/0961203312469261] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Background: Mycophenolate mofetil (MMF) has recently been established as a potent drug in maintenance treatment for lupus nephritis. However, there is no consensus on the optimal dosing regimen because of a high inter-individual variability of mycophenolic acid (MPA), the active metabolite of MMF. This retrospective study aimed to investigate the effect of an individualized dosing regimen through concentration-controlled treatment on MPA exposure and renal outcome in patients with lupus nephritis. Methods: Sixteen patients with lupus nephritis and treatment with low-dose intravenous cyclophosphamide followed by MMF were included. MPA area under the plasma concentration-time curve from 0 to 12 hours (MPA-AUC0–12) was assessed within a month after MMF initiation. After determination of MPA-AUC0–12, MMF doses were titrated to achieve a target MPA-AUC0–12 of 60–90 mg*h/l. After on average six months, MPA-AUC0–12 measures were repeated to assess the effect of dose adjustment. Results: One month after introducing MMF, MPA-AUC0–12 was low and showed a high inter-individual variability. Dose adjustment with a target MPA-AUC0–12 of 60–90 mg*h/l resulted in individualized MMF dosing, significantly higher MPA-AUC0–12 levels, and a non-significant reduction in variability of MPA-AUC0–12. Adverse effects were reported by 37.5% of patients, which resulted in a switch to azathioprine in two patients. There was no significant relationship between the occurrence of adverse effects and MPA-AUC0–12. At 12 months of follow-up 87.5% of patients had achieved either partial (18.7%) or complete (68.8%) remission. Conclusion: Concentration-controlled dose adjustments with a target MPA-AUC0–12 of 60–90 mg*h/l was associated with optimized MPA exposure and an excellent renal outcome at 12 months of follow-up in a small sample of SLE patients with lupus nephritis.
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Affiliation(s)
- GMN Daleboudt
- Department of Nephrology, Leiden University Medical Center, The Netherlands
| | - MEJ Reinders
- Department of Nephrology, Leiden University Medical Center, The Netherlands
| | - J den Hartigh
- Department of Clinical Pharmacy and Toxicology, Leiden University Medical Center, The Netherlands
| | - TWJ Huizinga
- Department of Rheumatology, Leiden University Medical Center, The Netherlands
| | - AJ Rabelink
- Department of Nephrology, Leiden University Medical Center, The Netherlands
| | - JW de Fijter
- Department of Nephrology, Leiden University Medical Center, The Netherlands
| | - SP Berger
- Department of Nephrology, Leiden University Medical Center, The Netherlands
- Department of Internal Medicine, Erasmus Medical Center, The Netherlands
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