Women who sleep for shorter periods and experience frequent snoring
prior to a breast cancer diagnosis may have a poorer prognosis.
This is the
finding of a new study published in the Journal of Clinical Sleep
Medicine.
Breast cancer is the most common cancer among women in the United States, after skin cancer.
According to the American Cancer Society, around 246,660 new
cases of invasive breast cancer will be diagnosed among women in the U.S. this year, and more
than 40,000 women will die from the disease.
Lead study author Amanda Phipps, assistant professor in
epidemiology at the University of Washington, and colleagues point to previous
studies that have suggested a link between poor sleep quality, short sleep
duration, and increased cancer risk.
"However,
the relationship between sleep and cancer outcomes has not been well
characterized," the authors note.
Two-fold
greater risk for breast cancer death for snorers, short sleepers
For their study, the researchers decided to assess whether
certain sleep characteristics impact the survival of women with breast cancer.
The team analyzed the data of 21,230 women who were part of the Women's Health Initiative - a longitudinal
study of postmenopausal women.
All women had been diagnosed with primary cancer - cancer that
has not spread beyond the primary site - at some point during study follow-up.
At the beginning of the study, each woman provided information
on sleep duration, snoring, and other sleep characteristics.
The team compared this data with information on the women's
cancer outcomes, in order to establish whether cancer survival is influenced by
sleep factors.
Compared with women with breast cancer who rarely snored and slept
for 7-8 hours each night, those with breast cancer who snored more than 5
nights a week and slept for less than 6 hours each night were at least two times more likely to die from the disease.
The results remained after accounting for a number of factors
that may influence the results.
These included participants' age at study enrollment, cancer
site, marital status, household income, smoking status, physical activity
status, and the time between data collection at study baseline and cancer
diagnosis.
The team notes that previous studies have shown that sleep
problems may boost tumor growth
and reduce cancer survival, possibly because poor sleep negatively impacts
inflammatory pathways.
Snoring
may be 'an important consideration' in cancer survival
Phipps says the team was surprised to find that snoring might be
associated with breast cancer survival.
"To our knowledge, snoring has not previously been evaluated
in relation to cancer survival, but our results suggest that it could be an
important consideration," she adds.
The researchers believe their findings highlight the importance
of adequate sleep duration and quality, particularly for breast cancer
patients.
According to the
American Academy of Sleep Medicine, adults should get around 7 hours of sleep each night in order to avoid the health risks
associated with poor sleep.
"Healthy,
sufficient sleep is essential for individual well-being, population health and
public safety," says Dr. Nathaniel Watson, president of the American
Academy of Sleep Medicine. "All adults should make it one of their top
health priorities to get at least 7 hours of sleep each night."
Source:
medicalnewstoday
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