Volume 123, Issue 3 pp. 577-585
Cancer Genetics

Pathway based analysis of SNPs with relevance to 5-FU therapy: Relation to intratumoral mRNA expression and survival

Silje H. Nordgard

Silje H. Nordgard

Department of Genetics, Institute for Cancer Research, Rikshospitalet-Radiumhospitalet Medical Center, Montebello, Oslo, Norway

Faculty of Medicine, University of Oslo, Norway

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Grethe I.G. Alnæs

Grethe I.G. Alnæs

Department of Genetics, Institute for Cancer Research, Rikshospitalet-Radiumhospitalet Medical Center, Montebello, Oslo, Norway

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Björn Hihn

Björn Hihn

Nanogen Europe BV, Helmond, Netherlands

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Ole Christian Lingjærde

Ole Christian Lingjærde

Department of Informatics, University of Oslo, Oslo, Norway

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Knut Liestøl

Knut Liestøl

Department of Informatics, University of Oslo, Oslo, Norway

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Anya Tsalenko

Anya Tsalenko

Agilent Technologies, Palo Alto, CA

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Therese Sørlie

Therese Sørlie

Department of Genetics, Institute for Cancer Research, Rikshospitalet-Radiumhospitalet Medical Center, Montebello, Oslo, Norway

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Per Eystein Lønning

Per Eystein Lønning

Institute of Medicine, University of Bergen, Norway

Department of Oncology, Haukeland University Hospital, Norway

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Anne-Lise Børresen-Dale

Anne-Lise Børresen-Dale

Department of Genetics, Institute for Cancer Research, Rikshospitalet-Radiumhospitalet Medical Center, Montebello, Oslo, Norway

Faculty of Medicine, University of Oslo, Norway

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Vessela N. Kristensen

Corresponding Author

Vessela N. Kristensen

Department of Genetics, Institute for Cancer Research, Rikshospitalet-Radiumhospitalet Medical Center, Montebello, Oslo, Norway

Faculty of Medicine, University of Oslo, Norway

Fax +47-22-93-44-40.

Department of Genetics, Institute for Cancer Research, Montebello, Oslo 0310, NorwaySearch for more papers by this author
First published: 28 May 2008
Citations: 18

Abstract

Genetic factors are thought to play a role in resistance towards chemotherapeutic agents such as 5-fluorouracil (5-FU). Approximately 30 genes are directly or indirectly involved in 5-FU metabolism, and genetic variation in any of these may contribute to anti-tumor response. Polymorphisms in these genes were analyzed in relation to tumoral mRNA levels of 5-FU metabolizing genes, response to chemotherapy and survival. A total of 21 genetic variants were studied in 35 breast cancer patients treated with 5-FluoroUracil, mitomycin (FUMI) and in a similar cohort of 90 doxorubicin treated breast cancer patients. Genotype distributions were compared using 109 healthy controls. No significant association was found between any polymorphisms and response to chemotherapy as measured by shrinkage of tumor. However, carriers of 3 copies of the TYMS 5′UTR repeat had shorter survival than noncarriers (p = .048) in the FUMI treatment group, but not in the doxorubicin treated group. Carriers of 3 copies of the repeat were also more frequently observed in both patients groups than in healthy controls (p = .034). Several highly significant associations were observed between genotypes and expression levels of 5-FU metabolizing genes. A SNP in codon 72 of TP53 was revealed to be a key regulator of 5-FU metabolizing genes such as DHFR and MTHFR, constituting 50% of all significant associations observed after FUMI therapy. These data suggest that 3 copies of the TYMS 5′UTR repeat may give a treatment specific reduced survival in breast cancer patients, and that TP53 may have a direct, allele specific, role in 5-FU mediated response. © 2008 Wiley-Liss, Inc.

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