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Risk factors for high-dose methotrexate-induced nephrotoxicity

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Abstract

High-dose methotrexate (MTX) is widely used for the treatment of hematological malignancies. Despite the application of routine supportive care measures, such as intensive fluid hydration and urine alkalinization, nephrotoxicity is still a problem. The present study aimed to evaluate the risk factors for MTX-induced nephrotoxicity. We retrospectively reviewed 88 patients who received a regimen consisting of high-dose MTX (1000 mg/m2) and cytosine arabinoside between 2006 and 2018. Nephrotoxicity (≥ grade 2) was observed in 11 patients. Nephrotoxicity was observed only in patients with a high MTX concentration. Other than the MTX concentration, the serum uric acid level and urine pH at day 1 were associated with nephrotoxicity. A multivariate analysis revealed that urine pH was an independent risk factor for MTX-induced nephrotoxicity. Urine pH < 7.0 at day 1 was a significant risk factor for nephrotoxicity (odds ratio, 8.05; 95% confidence interval 1.95–33.3) and was also a predictor of delayed MTX elimination at 72 h after injection. Among pre-treatment factors, a low serum calcium level predicted urine pH < 7.0 at day 1. In conclusion, the present study suggests that low urine pH at day 1 is an independent risk factor for MTX-induced nephrotoxicity.

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Authors

Contributions

SK designed the study and collected the data. SK, SI, and YK analyzed the data and wrote the manuscript. All authors read and approved the final manuscript.

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Correspondence to Yoshinobu Kanda.

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The authors declare no conflicts of interest.

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For this retrospective study, formal informed consents is not required. This retrospective study was approved by Jichi Medical University Clinical Research Ethics Committee.

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Kawaguchi, S., Fujiwara, Si., Murahashi, R. et al. Risk factors for high-dose methotrexate-induced nephrotoxicity. Int J Hematol 114, 79–84 (2021). https://doi.org/10.1007/s12185-021-03132-8

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  • DOI: https://doi.org/10.1007/s12185-021-03132-8

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