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A number of genes are involved in iron metabolism, including the transferrin receptor (TFR) and haemochromatosis (HFE) genes. In previous investigations an increased risk for neoplastic disease has been observed in individuals homo- and heterozygous for hereditary haemochromatosis. The HFE wild-type gene product complexes with the transferrin receptor (TF) and two different HFE mutations (Cys282Tyr and His63Asp) have been found to increase the affinity of TFR for TF and increase cellular iron uptake. In a recent study we found no associations for HFE and TFR separately, but an interaction between HFE and TFR genotypes in multiple myeloma. Individuals carrying the HFE Tyr282 allele (homo- and heterozygotes) in combination with homozygosity for the TFR Ser142 allele had an increased risk. In the present study the same association was found in breast and colorectal cancer. The odds ratio for all three neoplasms combined was 2.0 (95% CI 1.0-3.8). The risk for neoplastic disease was further increased (OR 7.7, 95% CI = 1.0-59.9) when the analysis was restricted to HFE Tyr homozygotes and compound heterozygotes in combination with TFR Ser homozygosity. Thus, an interaction between HFE and TFR alleles may increase the risk for different neoplastic disorders.

Interaction between haemochromatosis and transferrin receptor genes in different neoplastic disorders