Abstract
Purpose
High dose methotrexate (HDMTX) acute kidney injury (AKI) results in prolonged hospitalization and treatment delays. Using a pharmacologically-based approach, HDMTX was administered with standard combination therapy to patients with osteosarcoma; nephrotoxicity was assessed.
Methods
Patients were randomized by cycle to 4 h or 12 h HDMTX (12 g/m2) infusions administered with hydration, alkalization and leucovorin rescue. Urinalysis, AKI biomarkers, and estimated glomerular filtration rate using serum creatinine or cystatin C (GFRCr or GFRcysC) were obtained. Serum and urine methotrexate concentrations [MTX] were measured.
Results
Patients (n = 12), median (range) age 12.4 (5.7–19.2) years were enrolled; 73 MTX infusions were analyzed. Median (95% Confidence Interval) serum and urine [MTX] were 1309 (1190, 1400) µM and 16.4 (14.7, 19.4) mM at the end of 4 h infusion and 557 (493, 586) µM and 11.1 (9.9, 21.1) mM at the end of 12 h infusion. Time to serum [MTX] < 0.1 µM was 83 (80.7, 90.7) h and 87 (82.8, 92.4) h for 4 and 12 h infusions. GFRCr was highly variable, increased after cisplatin, and exceeded 150 ml/min/1.73 m2. GFRcysC was less variable and decreased at the end of therapy. AKI biomarkers were elevated indicating acute tubular dysfunction, however, did not differ between 4 and 12 h infusions. Radiographic and histological response were similar for patients receiving 4 h or 12 h infusions; the median percent tumor necrosis was > 95%.
Conclusions
Reducing peak serum and urine MTX concentration by prolonging the infusion duration did not alter risk of acute kidney injury. GFRcysC was decreased at the end of therapy. Proteinuria and elevations in AKI biomarkers indicate that direct tubular damage contributes to HDMTX nephrotoxicity.
Clinical Trial
NCT01848457.
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Acknowledgements
This work was funded by Gateway for Cancer Research Foundation and Alex's Lemonade Stand Center of Excellence.
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This clinical trial was funded by the Gateway for Cancer Research and Alex's Lemonade Stand Center of Excellence.
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Fox, E., Busch, C., DeBernardo, A. et al. A pharmacologically-based approach to high dose methotrexate administration to investigate nephrotoxicity and acute kidney injury biomarkers in children and adolescents with newly diagnosed osteosarcoma. Cancer Chemother Pharmacol 87, 807–815 (2021). https://doi.org/10.1007/s00280-021-04248-8
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DOI: https://doi.org/10.1007/s00280-021-04248-8