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Published in: Cancer Chemotherapy and Pharmacology 1/2020

01-07-2020 | Original Article

New DPYD variants causing DPD deficiency in patients treated with fluoropyrimidine

Authors: Xandra García-González, Bartosz Kaczmarczyk, Judith Abarca-Zabalía, Fabienne Thomas, Pilar García-Alfonso, Luis Robles, Vanessa Pachón, Ángeles Vaz, Sara Salvador-Martín, María Sanjurjo-Sáez, Luis A. López-Fernández

Published in: Cancer Chemotherapy and Pharmacology | Issue 1/2020

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Abstract

Purpose

Several clinical guidelines recommend genetic screening of DPYD, including coverage of the variants c.1905 + 1G>A(DPYD*2A), c.1679T>G(DPYD*13), c.2846A>T, and c.1129-5923C>G, before initiating treatment with fluoropyrimidines. However, this screening is often inadequate at predicting the occurrence of severe fluoropyrimidine-induced toxicity in patients.

Methods

Using a complementary approach combining whole DPYD exome sequencing and in silico and structural analysis, as well as phenotyping of DPD by measuring uracilemia (U), dihydrouracilemia (UH2), and the UH2/U ratio in plasma, we were able to characterize and interpret DPYD variants in 28 patients with severe fluoropyrimidine-induced toxicity after negative screening.

Results

Twenty-five out of 28 patients (90%) had at least 1 variant in the DPYD coding sequence, and 42% of the variants (6/14) were classified as potentially deleterious by at least 2 of the following algorithms: SIFT, Poly-Phen-2, and DPYD varifier. We identified two very rare deleterious mutations, namely, c.2087G>A (p.R696H) and c.2324T>G (p.L775W). We were able to demonstrate partial DPD deficiency, as measured by the UH2/U ratio in a patient carrying the variant p.L775W for the first time.

Conclusion

Whole exon sequencing of DPYD in patients with suspicion of partial DPD deficiency can help to identify rare or new variants that lead to enzyme inactivation. Combining different techniques can yield abundant information without increasing workload and cost burden, thus making it a useful approach for implementation in patient care.
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Metadata
Title
New DPYD variants causing DPD deficiency in patients treated with fluoropyrimidine
Authors
Xandra García-González
Bartosz Kaczmarczyk
Judith Abarca-Zabalía
Fabienne Thomas
Pilar García-Alfonso
Luis Robles
Vanessa Pachón
Ángeles Vaz
Sara Salvador-Martín
María Sanjurjo-Sáez
Luis A. López-Fernández
Publication date
01-07-2020
Publisher
Springer Berlin Heidelberg
Published in
Cancer Chemotherapy and Pharmacology / Issue 1/2020
Print ISSN: 0344-5704
Electronic ISSN: 1432-0843
DOI
https://doi.org/10.1007/s00280-020-04093-1

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