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Thymidylate synthase gene polymorphism determines response and toxicity of 5-FU chemotherapy

Abstract

Thymidylate synthase (TS) catalyses the conversion of deoxy-uridylate to deoxy-thymidylate and is essential for DNA synthesis. The human TS gene promoter is polymorphic, having either double or triple tandem repeats of a 28-bp sequence. Here we determined the significance of this polymorphism in humans and its prediction for clinical outcome of patients with metastatic colorectal cancer treated with 5-fluorouracil. The TS mRNA level was analyzed using RT-PCR. Individuals homozygous for the triple repeat variant (L/L) had 3.6 times higher TS mRNA levels compared to those homozygous for the double repeat variant (S/S) in tumor tissue (P = 0.004). We tested 50 patients with disseminated colorectal cancer who received 5-FU treatment to determine whether this TS polymorphism will predict clinical outcome. We found individuals with S/S genotype had a response rate of 50% (4/8) when compared to 9% (2/22) in those with L/L and 15% (3/20) in those with S/L genotype (P = 0.041). Patients with L/L had less severe side effects to 5-FU (P = 0.008). The data suggest that genotyping for the TS polymorphism may have the potential to identify patients more likely to respond to 5-FU based chemotherapy.

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Abbreviations

5-FU:

5-Fluorouracil

TS:

Thymidylate synthase

TP:

Thymidine phosphorylase

DPD:

Dihydropyrimidine dehydrogenase

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Acknowledgements

This work is funded by NIH grants R01 CA 82655, R01 CA74166 and P30 CA14089. JS is supported by Dr Mildred Scheel Stiftung, Bonn, Germany.

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Correspondence to H-J Lenz.

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Pullarkat, S., Stoehlmacher, J., Ghaderi, V. et al. Thymidylate synthase gene polymorphism determines response and toxicity of 5-FU chemotherapy. Pharmacogenomics J 1, 65–70 (2001). https://doi.org/10.1038/sj.tpj.6500012

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