Journal
FRONTIERS IN ONCOLOGY
Volume 10, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fonc.2020.01006
Keywords
night-shift work; carcinogenicity; meta-analysis; risk factor; odds ratio
Categories
Funding
- Natural Science Foundation of Shandong Province, China [ZR2017MH100]
- National Natural Science Foundation of China [81773527]
- Academic Promotion Program of Shandong First Medical University [2019QL017, 2019RC010]
- Shandong Province Higher Educational Young and Innovation Technology Supporting Program [2019KJL004]
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Background:Nightshift work introduces light at night and causes circadian rhythm among night workers, who are considered to be at increased risk of cancer. However, in the last 2 years, nine population-based studies reported insignificant associations between night-shift work and cancer risks. We aimed to conduct an updated systematic review and meta-analysis to ascertain the effect of night-shift work on the incidence of cancers. Methods:Our protocol was registered in PROSPERO and complied with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA). Embase, PubMed, and Web of Science databases were used to comprehensively search studies published up to May 31, 2019. The random-effect model (Der Simonian-Laird method) was carried out to combine the risk estimates of night-shift work for cancers. The dose-response meta-analysis was performed to verify whether the association was in a dose-dependent manner. Results:Our literature searching retrieved 1,660 publications. Included in the meta-analyses were 57 eligible studies with 8,477,849 participants (mean age 55 years; 2,560,886 men, 4,220,154 women, and 1,696,809 not mentioned). The pooled results showed that night-shift work was not associated with the risk of breast cancer (OR= 1.009, 95% CI = 0.984-1.033), prostate cancer (OR= 1.027, 95% CI = 0.982-1.071), ovarian cancer (OR= 1.027, 95% CI = 0.942-1.113), pancreatic cancer (OR= 1.007, 95% CI = 0.910-1.104), colorectal cancer (OR= 1.016, 95% CI = 0.964-1.068), non-Hodgkin's lymph (OR= 1.046, 95% CI = 0.994-1.098), and stomach cancer (OR= 1.064, 95% CI = 0.971-1.157), while night-shift work was associated with a reduction of lung cancer (OR= 0.949, 95% CI = 0.903-0.996), and skin cancer (OR= 0.916, 95% CI = 0.879-0.953). The dose-response meta-analysis found that cancer risk was not significantly elevated with the increased light exposure of night- shift work. Conclusion:This systematic review of 57 observational studies did not find an overall association between ever-exposure to night-shift work and the risk of breast, prostate ovarian, pancreatic, colorectal, non-Hodgkin's lymph, and stomach cancers.
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