Navigation Links
The interruption of biological rhythms during chemotherapy worsen its side effects
Date:5/21/2014

Patients receiving chemical treatment for cancer often suffer fatigue and body weight loss, two of the most worrying effects of this therapy linked to the alteration of their circadian rhythms.

The circadian system, better known as our biological clock, is responsible for coordinating all the processes that take place in our organism.

If it does not function correctly, what is known as a circadian disruption or chronodisruption, has for years been linked to an increased incidence of cancer, obesity, diabetes, depression, cognitive problems or cardiovascular diseases.

"Also, circadian disruption in cancer patients aggravates the prognosis of the disease and the chance of survival for these patients diminishes," Elisabet Ortiz Tudela, a researcher at the University of Murcia, told SINC.

The expert is the author of a study published in the 'International Journal of Cancer', which reveals the importance of assessing how the circadian system works in order to prevent chronodisruption and to implement measures to strengthen the biological clock in people whose system is damaged.

However, measuring how the biological clock works is not easy in humans given that the "machinery" is located within the suprachiasmatic nucleus in the hypothalamus, deep within the brain.

"Therefore, it is impossible to directly assess how the clock Works," adds Ortiz. "Today, biological rhythms are studied which are clock "interruptions" and which enable us to indirectly assess the status of the circadian system".

One of the most studied "interruptions", which can be measured with non-invasive techniques and during long periods of time, is the activity-rest rhythm.

Chronotherapy for cancer

Researchers characterised the evolution of the circadian system in cancer patients submitted to a standard chronotherapy protocol (synchronisation of medication with natural rhythms). The activity-rest rhythm was recorded in 49 patients with advanced cancer while being given a standard chronomodulated chemotherapy cycle, which resulted in circadian disruption.

All the parameters calculated according to the activity-rest rhythm worsened considerably with the chemotherapy. Also, the existence of circadian disruption during the treatment was linked to greater fatigue and body weight loss, two of the most worrying associated factors for doctors.

"After the treatment and at the end of the study, the mean values of all the parameters were recovered to near baseline values," stated the scientist from the institution in Murcia.

The results show four different patterns with regard to the evolution of the circadian system in response to the treatment: in 9.5% of the patients the activity-rest rhythm remained stable despite the chemotherapy, 14.3% of patients showed some improvement, 31% suffered alterations in response to the treatment and recovered completely at the end of the study and in 45% of these deterioration sustained, possibly through inadequate dosing or incorrect timing.

This effect shows the great differences between individuals, which could affect the effectiveness of the treatment.

"Minimising circadian disruption through the personalisation of chronotherapy delivery could help to improve clinical tolerability and potentially contribute towards the treatment being more effective," concludes Ortiz.


'/>"/>

Contact: Press Office
info@agenciasinc.es
34-914-251-820
FECYT - Spanish Foundation for Science and Technology
Source:Eurekalert

Related medicine news :

1. Results of the ARCTIC-INTERRUPTION trial presented at TCT 2013
2. A shorter interruption of anti-thrombotics does not influence peri-operative complications
3. Differences in generic pill characteristics may lead to interruptions in essential medication use
4. Genetic alterations in shared biological pathways as major risk factor for ASD
5. Potential biological factor contributing to racial disparities in prostate cancer
6. GeoScience.net Publishes 40,188 New Abstracts on Biological Alteration
7. Alcohol-related aggression: Social and neurobiological factors
8. Houston we have a problem: Microgravity accelerates biological aging
9. UCLA scientist uncovers biological clock able to measure age of most human tissues
10. Greek crisis has biological health effects
11. NIH Grant to support Mount Sinai Research Program to Create Biological Network Model of Alzheimer’s Disease in partnership with New York Stem Cell Foundation
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:6/27/2016)... ... June 27, 2016 , ... "FCPX editors can now ... of Final Cut Pro X," said Christina Austin - CEO of Pixel Film Studios. ... Final Cut Pro X users can now reveal the media of their split ...
(Date:6/27/2016)... ... June 27, 2016 , ... A revolution is ... emergency ambulance transport experience for the millions of people who require these medical ... the taxi industry through the use of technology. Now, SmartEMS has put forth ...
(Date:6/26/2016)... ... June 26, 2016 , ... On June 10-11, 2016, A ... 2016 Cereal Festival and World’s Longest Breakfast Table in Battle Creek, MI, where the ... history as home to some of the world’s leading providers of cereal and other ...
(Date:6/26/2016)... ... , ... Brent Kasmer, a legally blind and certified personal trainer is helping to develop a ... fitness app plans to fix the two major problems leading the fitness industry today:, ... type program , They don’t eliminate all the reasons people quit their exercise ...
(Date:6/25/2016)... ... , ... Austin residents seeking Mohs surgery services, can now turn to Dr. ... Russell Peckham for medical and surgical dermatology. , Dr. Dorsey brings specialization to include ... in Mohs Micrographic Surgery completed by Dr. Dorsey was under the direction of Glenn ...
Breaking Medicine News(10 mins):
(Date:6/24/2016)... 2016   Bay Area Lyme Foundation , ... Center for Tick Borne Illness , Harvard Medical ... Hacking Medicine, University of California, Berkeley, and the ... five finalists of Lyme Innovation , the ... 100 scientists, clinicians, researchers, entrepreneurs, and investors from ...
(Date:6/24/2016)... June 24, 2016 The Academy of Managed ... recommendations that would allow biopharmaceutical companies to more ... that make formulary and coverage decisions, a move that ... new medicines. The recommendations address restrictions in ... on the drug label, a prohibition that hinders decision ...
(Date:6/24/2016)... 24, 2016 Research and Markets has ... Companion Diagnostic Tests" report to their offering. ... Diagnostics The World Market for Companion Diagnostics ... diagnostics. Market analysis in the report includes the following: ... Vitro Diagnostic Kits) by Region (N. America, EU, ROW), 2015-2020 ...
Breaking Medicine Technology: