Abstract:
:The Xeroderma pigmentosum group D (XPD) protein is an essential participant in nucleotide excision repair and basal transcription. There is evidence that three common polymorphisms of the XPD gene (C156A, Asp312Asn, and Lys751Gln) may be associated with differential DNA repair activity. Because increased DNA repair plays an important role in chemoresistance to platinum-based compounds, we assessed the aforementioned polymorphisms in 73 patients with metastatic colorectal cancer and determined their outcome to 5-fluorouracil/oxaliplatin. Among those tested for the Lys751Gln polymorphism, 24% (5 of 21) patients with the Lys/Lys genotype responded, versus 10% (4 of 39) and 10% (1 of 10) of those with the Lys/Gln and Gln/Gln genotypes (P = 0.015). The median survival for those with the Lys/Lys genotype was 17.4 (95% CI 7.9, 26.5) versus 12.8 (95% CI 8.5, 25.9) and 3.3 (95% CI 1.4, 6.5) months for patients with the Lys/Gln and Gln/Gln respectively (P = 0.002). The polymorphisms C156A and Asp312Asn of the XPD gene were not associated with response to 5-fluorouracil/oxaliplatin nor with survival. However, a linkage was observed between the Lys751 allele and the C156 allele (P = 0.028), and between the Lys751Lys genotype and the Asp312Asp genotype (P < 0.001). We conclude that XPD Lys751Gln polymorphism may be an important marker in the prediction of clinical outcome to platinum-based chemotherapy.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Park DJ,Stoehlmacher J,Zhang W,Tsao-Wei DD,Groshen S,Lenz HJsubject
Has Abstractpub_date
2001-12-15 00:00:00pages
8654-8issue
24eissn
0008-5472issn
1538-7445journal_volume
61pub_type
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