Health
Breast cancer cells spread during sleep
New studies show that circulating breast cancer cells, which later form metastases, occur primarily during the sleep phase of humans.
To date, cancer research has paid less attention to the question of when tumors release metastatic cells. Researchers previously assumed that tumors would continuously release such cells.
According to the World Health Organization (WHO), breast cancer is one of the most common forms of cancer. Every year, about 2.3 million people worldwide suffer from the disease.
Patients usually respond well to treatment if the doctor detects breast cancer early enough.But if the cancer is already happening, things will be much more difficult Transferred..
“The tumor awakens when the affected person is asleep.”
Metastasis occurs when circulating cancer cells move away from the original tumor, move through the body through blood vessels, and form new tumors in other organs.
“When the affected person is asleep, the tumor awakens,” says research leader Nicola Aceto, a professor of molecular oncology at ETH Zurich.
During their study, which included 30 female cancer patients and a mouse model, researchers discovered that when the organism was asleep, the tumor produced more circulating cells. Cells that leave the tumor at night also divide more rapidly than circulating cells that leave the tumor during the day and are therefore more likely to form metastases.
“According to our research, Circulating cancer cells From the original tumor, it is controlled by the following hormones: MelatoninIt determines our day and night rhythms, “says postdoctoral researcher and lead author of the study, Zoi Diamantopoulou. Nature..
In addition, this study shows that the time a tumor or blood sample is taken for diagnosis can affect the findings of oncologists. It was the accidental discovery along these lines that first put the researchers on the right track.
“Some of my colleagues work early in the morning or late in the evening. Sometimes they analyze blood at unusual times,” says Aceto. Scientists were surprised that the levels of circulating cancer cells in samples taken at different times of the day were very different.
Another clue was the surprisingly high number of cancer cells found per unit of blood in mice compared to humans. The reason is that as a nocturnal animal, mice sleep during the day and scientists collect most samples.
“In our view, these findings may indicate that healthcare professionals need to systematically record the time they perform. biopsy“Aceto says. “It may help make the data truly comparable.”
The next step for researchers is to understand how these findings can be incorporated into existing cancer treatments to optimize treatment. As part of further patient research, Aceto will help determine whether different types of cancer behave like breast cancer and make existing treatments more successful when patients are treated at different times. I would like to investigate if I can do it.
sauce: ETH Zurich
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