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Melatonin shows potential to slow tumor growth in certain breast cancers
Date:1/28/2014

mice were randomly assigned to either the melatonin or control groups. The melatonin group received treatment each night for 21 days; melatonin was administered at pharmacologic concentration one hour before room lighting was switched off. Melatonin administered prior to the nocturnal is believed to be more effective because tissues are most sensitive to the hormone at this time.

At the end of the 21-day treatment, researchers used single photon emission computed tomography (SPECT) to determine whether melatonin therapy effectively decreased the size of implanted human triple negative breast cancer in the mouse models and if there was be any changes in the formation of new blood vessels.

Additionally, tumor volume was measured each week and tumor tissue was analyzed at the end of treatment.

The study found that none of the treated mice showed any loss of weight and lethargy during the 21-day treatment; instead, most showed excessive movement but no irritability or aggressive behavior.

Those treated showed significantly smaller tumors after 21 days while the mean tumor volume increased significantly in the control group. And, there was less vascular growth in the tumors of the treated group.

Results were also replicated in cell models.

The study showed that melatonin administered at pharmacologic concentration was able to reduce ER-negative breast cancer cell viability in vitro.

These results suggest that melatonin has the potential as a therapeutic agent for breast cancer.

The study's authors caution, however, that this research is still in its very early stages and results are not yet ready to be translated for patient use.

More basic research is needed on this topic particularly on how melatonin acts on angiogenesis in various cancers before clinical trials with humans can be planned.


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Contact: Krista Hopson
khopson1@hfhs.org
313-874-7207
Henry Ford Health System
Source:Eurekalert

Page: 1 2

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