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. 2020 Jan;29(1):133-140.
doi: 10.1158/1055-9965.EPI-19-0325. Epub 2019 Oct 30.

Night-Shift Work Duration and Risk of Colorectal Cancer According to IRS1 and IRS2 Expression

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Night-Shift Work Duration and Risk of Colorectal Cancer According to IRS1 and IRS2 Expression

Yan Shi et al. Cancer Epidemiol Biomarkers Prev. 2020 Jan.

Abstract

Background: We hypothesized that the risk of colorectal cancer in night-shift workers might be different according to insulin receptor substrate status.

Methods: Among 77,470 eligible women having night work assessed in the Nurses' Health Study, we documented a total of 1,397 colorectal cancer cases, of which 304 or 308 had available data on IRS1 and IRS2, respectively. We used duplication-method Cox proportional hazards regression analysis for competing risks to calculate HRs and 95% confidence intervals (CI) for each colorectal cancer subtype. We measured tumor IRS1 or IRS2 expression by immunohistochemistry (IHC).

Results: Compared with women who never worked night shifts, those working ≥15 years night shifts had a marginal trend of increased overall risk of colorectal cancer (P trend = 0.06; multivariable HR = 1.20; 95% CI, 0.99-1.45). Longer duration of night-shift work was associated with a higher risk of IRS2-positive tumors (multivariable HR = 2.69; 95% CI, 1.48-4.89; P trend = 0.001, ≥15 years night shifts vs. never) but not with IRS2-negative tumors (multivariable HR = 0.90; 95% CI, 0.54-1.51; P trend = 0.72; P heterogeneity for IRS2 = 0.008). Similarly, the corresponding multivariable HRs were 1.81 for IRS1-positive tumors (95% CI, 0.94-3.48; P trend = 0.06) and 1.13 for IRS1-negative tumors (95% CI, 0.71-1.80; P trend = 0.56; P heterogeneity for IRS1 = 0.02).

Conclusions: Our molecular pathologic epidemiology data suggest a potential role of IRS in mediating carcinogenesis induced by night-shift work.

Impact: Although these findings need validation, rotating night shift might increase colorectal cancer risk in women with abnormal insulin receptor pathways.

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Conflict of interest statement

Conflict of interest statement: None declared.

Figures

Figure 1.
Figure 1.
Flow chart of the study population in the Nurses’ Health Study.

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References

    1. Straif K, Baan R, Grosse Y, Secretan B, El Ghissassi F, Bouvard V, et al. Carcinogenicity of shift-work, painting, and fire-fighting. The Lancet Oncology 2007;8(12):1065–6 doi 10.1016/S1470-2045(07)70373-X. - DOI - PubMed
    1. group IMV. Carcinogenicity of night shift work. The Lancet Oncology 2019. doi 10.1016/S1470-2045(19)30455-3. - DOI - PubMed
    1. Papantoniou K, Castano-Vinyals G, Espinosa A, Turner MC, Alonso-Aguado MH, Martin V, et al. Shift work and colorectal cancer risk in the MCC-Spain case-control study. Scandinavian journal of work, environment & health 2017;43(3):250–9 doi 10.5271/sjweh.3626. - DOI - PubMed
    1. Schernhammer ES, Laden F, Speizer FE, Willett WC, Hunter DJ, Kawachi I, et al. Night-shift work and risk of colorectal cancer in the nurses’ health study. Journal of the National Cancer Institute 2003;95(11):825–8. - PubMed
    1. Tsai RJ, Luckhaupt SE, Sweeney MH, Calvert GM. Shift work and cancer screening: do females who work alternative shifts undergo recommended cancer screening? Am J Ind Med 2014;57(3):265–75 doi 10.1002/ajim.22285. - DOI - PMC - PubMed

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