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Circadian-system alterations during cancer processes: a review
1Laboratoire Rythmes Biologiques et Chronothérapeutique, Université Paris XI & I.C.I.G., Hopital Paul Brousse, Villejuif, France.
International Journal of Cancer
|January 17, 1997
Summary
Cancer development alters body rhythms, impacting treatment. Large-scale studies are needed to understand these circadian rhythm changes and personalize cancer chronotherapy for better patient outcomes.
Area of Science:
- Chronobiology
- Oncology
- Cancer Research
Background:
- Tumors and hosts can display normal or altered circadian rhythms.
- Rhythm alterations like amplitude damping and phase shifts worsen with cancer progression.
- Changes vary by tumor type, growth rate, and differentiation.
Purpose of the Study:
- To investigate the incidence and mechanisms of cancer-associated circadian system alterations.
- To establish correlations between rhythm alterations and patient outcomes.
- To determine the need for individualized chronotherapy in cancer patients.
Main Methods:
- Analysis of murine and human data on circadian rhythms in cancer.
- Assessment of rhythm parameters including amplitude, phase, and period (tau).
- Exploration of ultradian rhythms (tau < 20 hr) in late-stage cancer.
Main Results:
- Circadian rhythm alterations are common in cancer patients.
- Rhythm disturbances become more pronounced in advanced cancer stages.
- Variability in rhythm alterations exists based on tumor characteristics.
Conclusions:
- Individual circadian rhythm assessment is crucial for cancer patients.
- Understanding these alterations can optimize chemotherapy efficacy and tolerability.
- Personalized chronomodulated schedules may improve patient outcomes, especially those with circadian disturbances.