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A Meta-analysis of Individual Participant Data Reveals an Association between Circulating Levels of IGF-I and Prostate Cancer Risk
Univ Oxford, Nuffield Dept Populat Hlth, Canc Epidemiol Unit, Oxford, England..
Univ Oxford, Nuffield Dept Populat Hlth, Canc Epidemiol Unit, Oxford, England..
Univ Bristol, Sch Social & Community Med, Bristol, Avon, England.;Univ Bristol, MRC, Univ Bristol Integrat Epidemiol Unit, Bristol, Avon, England.;Natl Inst Hlth Res Bristol, Biomed Res Unit Nutr, Bristol, Avon, England..
Univ Bristol, Fac Med, Sch Clin Sci, Bristol, Avon, England..
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2016 (English)In: Cancer Research, ISSN 0008-5472, E-ISSN 1538-7445, Vol. 76, no 8, 2288-2300 p.Article in journal (Refereed) PublishedText
Abstract [en]

The role of insulin-like growth factors (IGF) in prostate cancer development is not fully understood. To investigate the association between circulating concentrations of IGFs (IGF-I, IGF-II, IGFBP-1, IGFBP-2, and IGFBP-3) and prostate cancer risk, we pooled individual participant data from 17 prospective and two cross-sectional studies, including up to 10,554 prostate cancer cases and 13,618 control participants. Conditional logistic regression was used to estimate the ORs for prostate cancer based on the study-specific fifth of each analyte. Overall, IGF-I, IGF-II, IGFBP-2, and IGFBP-3 concentrations were positively associated with prostate cancer risk (P-trend all <= 0.005), and IGFBP-1 was inversely associated weakly with risk (P-trend = 0.05). However, heterogeneity between the prospective and cross-sectional studies was evident (P-heterogeneity = 0.03), unless the analyses were restricted to prospective studies (with the exception of IGF-II, P-heterogeneity = 0.02). For prospective studies, the OR for men in the highest versus the lowest fifth of each analyte was 1.29 (95% confidence interval, 1.16-1.43) for IGF-I, 0.81 (0.68-0.96) for IGFBP-1, and 1.25 (1.12-1.40) for IGFBP-3. These associations did not differ significantly by time-to-diagnosis or tumor stage or grade. After mutual adjustment for each of the other analytes, only IGF-I remained associated with risk. Our collaborative study represents the largest pooled analysis of the relationship between prostate cancer risk and circulating concentrations of IGF-I, providing strong evidence that IGF-I is highly likely to be involved in prostate cancer development.

Place, publisher, year, edition, pages
2016. Vol. 76, no 8, 2288-2300 p.
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Cancer and Oncology
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URN: urn:nbn:se:uu:diva-296855DOI: 10.1158/0008-5472.CAN-15-1551ISI: 000374170700025PubMedID: 26921328OAI: oai:DiVA.org:uu-296855DiVA: diva2:940246
Available from: 2016-06-20 Created: 2016-06-20 Last updated: 2016-06-20Bibliographically approved

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