Abstract
Purpose
Aminopterin offers advantages over the related antifolate, methotrexate, including greater potency, complete bioavailability, and more consistent accumulation and metabolism by patients’ blasts. This current trial was done to document the toxicity of the aminopterin within a multiagent therapeutic regimen for children with newly diagnosed ALL.
Experimental Design
Patients at high risk of relapse were non-randomly assigned to therapy including oral aminopterin 4 mg/m2, in two doses 12 h apart, in place of methotrexate 100 mg/m2 in four divided doses.
Results
Thirty-two patients, 22 with pre-B ALL and ten with T-lineage ALL, have been treated with aminopterin, with median follow up of 40 months. Hematologic, mucosal and hepatic toxicity has been tolerable and reversible. There have been no toxic deaths among patients in remission. During weekly AMT therapy, higher mean neutrophil counts were observed among patients who were wild type for polymorphisms in methylene tetrahydrofolate reductase and methionine synthase reductase.
Conclusions
Aminopterin can be safely incorporated in multiagent therapy for patients with ALL, in place of systemic methotrexate, without causing excessive toxicity. These results support a larger trial comparing the efficacy and toxicity of aminopterin and methotrexate in therapy for patients with ALL.
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Acknowledgments
PDC is a Damon Runyon-Lilly Clinical Investigator, supported in part by the Damon Runyon Cancer Research Foundation (CI-16-03). BAK is an American Cancer Society Professor. This work was supported in part by an FDA Orphan Products Development grant (FD-R-001832-03) and by the Institute for Children with Cancer and Blood Disorders, New Brunswick, NJ.
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Disclosure: The following relationships could be construed as resulting in an actual, potential, or apparent conflict of interest with regard to the manuscript submitted for review: Dr. Zebala works for Syntrix Biosystems, Inc., which is commercializing aminopterin under an exclusive license from UMDNJ. If aminopterin were approved and made commercially available, Drs. Cole and Kamen are entitled to a portion of royalties paid to UMDNJ as per the UMDNJ employment agreement.
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Cole, P.D., Drachtman, R.A., Masterson, M. et al. Phase 2B trial of aminopterin in multiagent therapy for children with newly diagnosed acute lymphoblastic leukemia. Cancer Chemother Pharmacol 62, 65–75 (2008). https://doi.org/10.1007/s00280-007-0576-7
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DOI: https://doi.org/10.1007/s00280-007-0576-7