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- W2018449382 abstract "The phenotype of hereditary nonpolyposis colorectal cancer shows interfamilial and intrafamilial variation even in the presence of identical predisposing mutations, suggesting the existence of additional phenotype determinants. The modifying role of genetic polymorphisms in loci involved in carcinogen metabolism was studied.We focused on colon cancers from kindreds sharing one of two predisposing mutations (mutation 1 or 2) in the mismatch repair gene MLH1 (78 and 14 tumors, respectively). Polymorphisms in N-acetyltransferase 1 (NAT1) and glutathione S-transferase (GST) M1 and GSTT1 were investigated.The NAT1 allele 10 was associated with lower median age at diagnosis in both groups. In mutation 1 group, the NAT1 allele 10 was a risk factor for distal tumor location, both alone (P = 0.028) and combined with the GSTT1-positive genotype (P = 0.008). On the other hand, the combined null genotype of GSTM1 and GSTT1 was associated with proximal tumors. Associations with tumor location were not observed in patients with mutation 2, probably reflecting a small sample size.The results suggest that genetic polymorphisms in carcinogen metabolism modify the age of onset and tumor location in individuals with inherited deficiency of DNA mismatch repair." @default.
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- W2018449382 date "1998-12-01" @default.
- W2018449382 modified "2023-09-27" @default.
- W2018449382 title "Genetic polymorphisms in carcinogen metabolism and their association to hereditary nonpolyposis colon cancer" @default.
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- W2018449382 doi "https://doi.org/10.1016/s0016-5085(98)70017-4" @default.
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