NUDT15 and TPMT genetic polymorphisms are related to 6-mercaptopurine intolerance in children treated for acute lymphoblastic leukemia at the Children's Cancer Center of Lebanon.
Pediatr Blood Cancer
; 64(1): 146-150, 2017 01.
Article
en En
| MEDLINE
| ID: mdl-27577869
ABSTRACT
BACKGROUND:
Interindividual variability in thiopurine-related toxicity could not be completely explained by thiopurine S-methyltransferase (TPMT) polymorphisms, as a number of patients who are homozygous wild type or normal for TPMT still develop toxicity that necessitates 6-mercaptopurine (MP) dose reduction or protocol interruption. Recently, few studies reported on an inherited nucleoside diphosphate-linked moiety X motif 15 (NUDT15) c.415C>T low-function variant that is associated with decreased thiopurine metabolism and leukopenia in childhood acute lymphoblastic leukemia (ALL) and other diseases. PROCEDURES The aim of this study is to measure the frequency of TPMT and NUDT15 polymorphisms and assess whether they are predictors of MP intolerance in children treated for ALL. One hundred thirty-seven patients with ALL of whom 121 were Lebanese were evaluated. MP dose intensity was calculated as the ratio of the tolerated MP dose to planned dose during continuation phase to maintain an absolute neutrophil count (ANC) dose above 300 per µl.RESULTS:
One patient was NUDT15 heterozygous TC and tolerated only 33.33% of the planned MP dose, which was statistically significantly different from the median-tolerated MP dose intensity of the rest of the cohort (76.00%). Three patients had the TPMT*3A haplotype and tolerated 40.00-66.66% of the planned MP dose, which was also statistically significantly different from the rest of the cohort.CONCLUSIONS:
This is the first report on the association of TPMT and NUDT15 polymorphisms with MP dose intolerance in Arab patients with ALL. Genotyping for additional polymorphisms may be warranted for potential gene/allele-dose effect.Palabras clave
Texto completo:
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Bases de datos:
MEDLINE
Asunto principal:
Polimorfismo Genético
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Pirofosfatasas
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Resistencia a Antineoplásicos
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Leucemia-Linfoma Linfoblástico de Células Precursoras
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Mercaptopurina
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Metiltransferasas
Tipo de estudio:
Observational_studies
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Prognostic_studies
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Risk_factors_studies
Límite:
Adolescent
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Child
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Child, preschool
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Female
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Humans
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Male
País/Región como asunto:
Asia
Idioma:
En
Revista:
Pediatr Blood Cancer
Asunto de la revista:
HEMATOLOGIA
/
NEOPLASIAS
/
PEDIATRIA
Año:
2017
Tipo del documento:
Article
País de afiliación:
Líbano