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Updated: Sep 9, 2025

Human Circadian Phenotyping and Diurnal Performance Testing in the Real World
Published on: April 7, 2020
Cancer Patients Circadian Rhythm Assessment Based on Morningness-Eveningness Preference: A Cross-Sectional Study
Ghazal Daftari1, Mahsa Abbaszadeh2, Sahar Karimpour Reyhan2
1Department of Internal Medicine Imam Khomeini Hospital Complex Tehran University of Medical Sciences Tehran Iran.
Background And Aim:
The circadian rhythm regulates various physiological processes, including sleep-wake cycle, cell division and cancer development. This study aimed to investigate circadian rhythm patterns in cancer patients.
Methods:
In this cross-sectional study, 150 cancer patients admitted to the hospital enrolled the study during the fall of 2022. The demographic characteristics of patients were collected using a checklist. Patients also completed a morningness-eveningness questionnaire (MEQ). Utilizing Analysis of Variance (ANOVA) and Fisher's exact test, circadian rhythm types with continuous and categorical variables were compared.
Results:
The mean age of the study's participants was 49.83 ± 14.53 years. A total of 82.7% (n = 124) had non-hematological cancers, and breast cancer was the most prevalent type of cancer among patients (23.3%). The MEQ of the patients studied ranged from 41 to 74, with a mean score of 56.6 ± 6.34.
Conclusion:
According to the findings of this study, the circadian rhythm is distributed normally among the participants.
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