Kantonsspital St.Gallen

Rational administration schedule for high-dose methotrexate in patients with primary central nervous system lymphoma

Markus Joerger, A D R Huitema, G Illerhaus & A J M Ferreri

abstract Methotrexate (MTX) at a dose of ≥1 g/m(2) remains the most efficient treatment against primary central nervous system lymphoma (PCNSL), and is the most widely used drug in prospective clinical trials. MTX is a folate analog that inhibits dihydrofolate reductase, thereby blocking de novo purine synthesis. MTX as well as 7-hydroxy-MTX, its main metabolite in serum, are both eliminated by the kidneys. The elimination of MTX is prolonged in patients with renal impairment and third-space fluid collections, and in patients receiving concurrent non-steroidal antirheumatic drugs, benzimidazoles and sulfonamides, among others. Main adverse events with high-dose MTX include severe myelosuppression, renal dysfunction and stomatitis. Supportive measures such as rigorous hydration, urine alkalinization and careful drug monitoring with supplemental leucovorin rescue are crucial to avoid significant toxicity. Strategies to optimize clinical efficacy of high-dose MTX in patients with PCNSL include administration of 3 h instead of longer infusions, potentially supplemented with an additional intravenous MTX bolus, and maintaining MTX dose intensity over the course of four treatment cycles. Some pharmacological studies suggest that achieving an MTX area under the plasma concentration-time curve (AUC(MTX)) of between 1000 and 1100 μmol.h/L may improve clinical outcome, but clinical data are not conclusive at present. In this review, we analyze the impact of patient, lymphoma and pharmacokinetic variables on the antitumor activity of high-dose MTX in patients with PCNSL, summarize recommendations for daily clinical practice and give some suggestions for future trials.
citation Joerger M, Huitema A D R, Illerhaus G, Ferreri A J M. Rational administration schedule for high-dose methotrexate in patients with primary central nervous system lymphoma. Leuk Lymphoma 2012; 53:1867-75.
type journal paper/review (English)
date of publishing 21-05-2012
journal title Leuk Lymphoma (53/10)
ISSN electronic 1029-2403
pages 1867-75
PubMed 22530664
DOI 10.3109/10428194.2012.676177