Abstract:
:Epidemiologic studies linking high serum iron with cancer risks are limited and inconclusive, despite evidence implicating body iron in human carcinogenesis. A cohort of 309,443 adults in Taiwan who had no history of cancer had serum iron levels tested at the time of recruitment (1997-2008). Initially measured iron levels were associated with subsequent cancer risk by linking individuals with the National Cancer Registry and National Death File. HRs were calculated by the Cox model. One third of males (35%) and one fifth of females (18%) had high serum iron (≥120 μg/dL), which was associated with a 25% increase in risk for incidence of all cancers [HR, 1.25; 95% confidence interval (CI), 1.16-1.35] and with a 39% increase in risk for mortality from all cancers (HR, 1.39; 95% CI, 1.23-1.57). The relationship between serum iron and cancer risk was a J-shaped one, with higher cancer risk at both ends, either at lower than 60 μg/dL or higher than 120 μg/dL. At the higher end, cancer risk increased by 4% for every 10 μg/dL increment above 80 μg/dL, showing a dose-response relationship, with 60 to 79 μg/dL as a reference level. In a sensitivity analysis, the increases in risk were still observed after the first 5 years of cancer cases were excluded. Liver cancer risk was increased in HBV (-) non-hepatitis B carrier (3-fold) and HBV (+) hepatitis B carrier (24-fold). Lifestyle risks such as smoking, drinking, or inactivity interacted synergistically with high serum iron and significantly increased the cancer risks. The liver (HR, 2.49; 95% CI, 1.97-3.16) and the breast (HR, 1.31; 95% CI, 1.01-1.70) were the two major cancer sites where significant cancer risks were observed for serum iron either ≥120 μg/dL or ≥140 μg/dL, respectively. This study reveals that high serum iron is both a common disorder and a marker of increased risk for several cancers.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Wen CP,Lee JH,Tai YP,Wen C,Wu SB,Tsai MK,Hsieh DP,Chiang HC,Hsiung CA,Hsu CY,Wu Xdoi
10.1158/0008-5472.CAN-14-0360subject
Has Abstractpub_date
2014-11-15 00:00:00pages
6589-97issue
22eissn
0008-5472issn
1538-7445pii
0008-5472.CAN-14-0360journal_volume
74pub_type
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