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20.08.2016 | Short Communication

Patients homozygous for DPYD c.1129-5923C>G/haplotype B3 have partial DPD deficiency and require a dose reduction when treated with fluoropyrimidines

verfasst von: Didier Meulendijks, Linda M. Henricks, André B. P. van Kuilenburg, Bart A. W. Jacobs, Abidin Aliev, Lisette Rozeman, Judith Meijer, Jos H. Beijnen, Hiltje de Graaf, Annemieke Cats, Jan H. M. Schellens

Erschienen in: Cancer Chemotherapy and Pharmacology | Ausgabe 4/2016

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Abstract

Purpose

Dihydropyrimidine dehydrogenase (DPD) is a critical determinant of 5-fluorouracil pharmacology, and reduced activity of DPD as a result of deleterious polymorphisms in the gene encoding DPD (DPYD) can result in severe treatment-related toxicity. Dosing recommendations to individualize treatment have been provided for three DPYD variants (DPYD*2A, c.2846A>T, and c.1679T>G). A fourth variant, c.1129-5923C>G/HapB3, has been shown to increase the risk of fluoropyrimidine-associated toxicity, but little is known about the functional effects of this variant.

Methods

By performing a large retrospective screen for DPYD variants, we identified three patients who were homozygous for c.1129-5923C>G/HapB3. We describe their clinical course of treatment and analyzed DPD activity and DPYD gene expression, to provide insight into the phenotypic effects of c.1129-5923C>G/HapB3.

Results

DPD activity could be measured in two patients and was 4.1 and 5.4 nmol/mg/h (DPD activity 41 and 55 % compared to controls, respectively). The fluoropyrimidine dose had to be reduced during treatment in both patients. In line with partial DPD deficiency in both patients, sequence analysis of DPD cDNA demonstrated a normal-sized (wild type) cDNA fragment of 486 bp, as well as a larger-sized (mutant) 530-bp fragment containing an aberrant 44-bp insertion in intron 10. Patient three tolerated treatment well, but DPD activity measurement was not possible as the patient had deceased at the time of performing the study.

Conclusions

The presented functional and clinical data indicate that the c.1129-5923C>G variant is both functionally and clinically relevant, and support an upfront dose reduction of the fluoropyrimidine starting dose in patients carrying c.1129-5923C>G homozygously.

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Titel: Patients homozygous for DPYD c.1129-5923C>G/haplotype B3 have partial DPD deficiency and require a dose reduction when treated with fluoropyrimidines
verfasst von: Didier Meulendijks
Linda M. Henricks
André B. P. van Kuilenburg
Bart A. W. Jacobs
Abidin Aliev
Lisette Rozeman
Judith Meijer
Jos H. Beijnen
Hiltje de Graaf
Annemieke Cats
Jan H. M. Schellens
Publikationsdatum: 20.08.2016
Verlag: Springer Berlin Heidelberg
Erschienen in: Cancer Chemotherapy and Pharmacology / Ausgabe 4/2016
Print ISSN: 0344-5704
Elektronische ISSN: 1432-0843
DOI: https://doi.org/10.1007/s00280-016-3137-0

Springer Medizin

Patients homozygous for DPYD c.1129-5923C>G/haplotype B3 have partial DPD deficiency and require a dose reduction when treated with fluoropyrimidines