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    Area of Science:

    • Chronobiology
    • Oncology
    • Environmental Health

    Background:

    • Diurnal rhythms, or circadian rhythms, are endogenous biological processes that regulate physiological functions over a 24-hour period.
    • Disruptions to these rhythms, often caused by shift work or irregular sleep patterns, have been linked to various health issues.
    • The potential carcinogenic effects of circadian disruption are an area of growing scientific interest.

    Purpose of the Study:

    • To evaluate the carcinogenic potential of disruptions to diurnal rhythms.
    • To compare the magnitude of this risk to established carcinogens like ultraviolet (UV) light.

    Main Methods:

    • Literature review and meta-analysis of epidemiological studies.
    • Classification of shift work and circadian disruption based on established carcinogen assessment criteria.

    Main Results:

    • Shift work that disrupts diurnal rhythms has been classified as a Group 1 carcinogen.
    • The carcinogenic risk associated with circadian disruption is comparable to that of UV radiation exposure.

    Conclusions:

    • Circadian disruption due to factors like shift work poses a significant carcinogenic risk.
    • Public health strategies should address the occupational and environmental factors that disrupt diurnal rhythms.