Dr. Whang Comments:
This is a first. We believe that PSA is elevated in patients with enlarged prostate, prostate inflammation or prostate cancer. Despite this study, I am not certain that working at night leads to increased risk of prostate cancer. But, I guess we need to keep an eye on this topic.
Elevated PSA Linked to Shiftwork
Men who work night shifts or rotating shifts are more likely to have elevated PSA levels than men who do not, according to researchers.
In an analysis of data from the National Health and Nutrition Examination Survey (2005-2010), Erin E. Flynn-Evans, PhD, of Brigham and Women's Hospital in Boston, and colleagues found such shiftworkers had a 2.6 times increased risk of an elevated PSA (4.0 ng/mL or higher) compared with non-shiftworkers after adjusting for confounders.
The researchers, who published their findings online ahead of print in the Journal of the National Cancer Institute, concluded: “Our data support the notion that sleep or circadian disruption is associated with elevated PSA, indicating that shiftworking men likely have an increased risk of developing prostate cancer.”
A previous prospective cohort study of Japanese rotating-shift workers demonstrated that, compared with day workers, rotating-shift workers had a significant threefold increased risk of prostate cancer after adjusting for age, family history of prostate cancer, and other potential confounders, according to a report in the American Journal of Epidemiology (2006;164;549-555).