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Published in: Cancer Chemotherapy and Pharmacology 2/2019

01-02-2019 | Original Article

A prospective study of a simple algorithm to individually dose high-dose methotrexate for children with leukemia at risk for methotrexate toxicities

Authors: Jennifer H. Foster, Patrick A. Thompson, M. Brooke Bernhardt, Judith F. Margolin, Susan G. Hilsenbeck, Eunji Jo, Deborah A. Marquez-Do, Michael E. Scheurer, Eric S. Schafer

Published in: Cancer Chemotherapy and Pharmacology | Issue 2/2019

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Abstract

Purpose

High-dose methotrexate (HDMTX) is critical to the successful treatment of pediatric acute lymphoblastic leukemia (ALL) but can cause significant toxicities. This study prospectively evaluated the effectiveness of a fixed algorithm which requires no real-time pharmacokinetic modeling and no previous patient exposure to HDMTX, to individualize HDMTX dosing for at-risk patients with the aim of avoiding methotrexate-related toxicities.

Methods

We developed a simple algorithm to individualize HDMTX infusions with 0–2 rate adjustments based on methotrexate levels during the infusion. This was a prospective, open-label, study; eligible patients were identified and referred by their oncologist.

Results

Fifty-four evaluable cycles of HDMTX (5 g/m2 over 24 h) were administered to 22 patients. Blood samples were obtained in 21 patients to examine single nucleotide polymorphisms (SNPs) related to methotrexate disposition. Twelve (54.5%) subjects had a history of previous HDMTX toxicities including seven (31.8%) who previously required glucarpidase rescue and seven (31.8%) with an entry glomerular filtration rate < 80 ml/min/1.73 m2. 107/110 (97.2%) of methotrexate levels were drawn properly and 100% of algorithm dosing instructions were performed correctly at the bedside. Thirty-five (64.8%) of all cycles and 24 of 33 (72.7%) cycles that required a dose-adjustment had an end 24-h methotrexate level (Cpss) within our goal range of 65 ± 15 µM with only 3 (5.6%) resulting in Cpss higher than goal. Grade 3/4 toxicities were rare; no patients developed > Grade 1 acute kidney injury.

Conclusion

This algorithm is a simple, safe and effective method for individualizing HDMTX in pediatric patients with ALL.

Clinicaltrials.gov Registry

NCT02076997.
Appendix
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Metadata
Title
A prospective study of a simple algorithm to individually dose high-dose methotrexate for children with leukemia at risk for methotrexate toxicities
Authors
Jennifer H. Foster
Patrick A. Thompson
M. Brooke Bernhardt
Judith F. Margolin
Susan G. Hilsenbeck
Eunji Jo
Deborah A. Marquez-Do
Michael E. Scheurer
Eric S. Schafer
Publication date
01-02-2019
Publisher
Springer Berlin Heidelberg
Published in
Cancer Chemotherapy and Pharmacology / Issue 2/2019
Print ISSN: 0344-5704
Electronic ISSN: 1432-0843
DOI
https://doi.org/10.1007/s00280-018-3733-2

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