Washington: A new study has associated sleep apnea severity with increased cancer mortality.The research adds to evidence presented earlier this year highlighting a link between severe sleep apnea and cancer. Two further studies presented at the ERS Congress, also show evidence suggesting an increase in cancer incidence among sleep apnea patients and an association between the spread of cancer and sleep apnea.In the first study, over 5,600 patients from 7 different sleep clinics in Spain were analysed to investigate the link between sleep apnea and cancer mortality. The severity of sleep apnea was then measured, using a hypoxaemia index. This index measures the amount of time during the night that a person suffers from low levels of oxygen in the blood (less than 90 percent oxygen saturation). The results showed that people with sleep apnea who spent more than 14 percent of their sleep with levels of oxygen saturation below 90 percent (usually severe sleep apnea patients) had approximately double the relative risk of death due to cancer (odds ratio 1.94), than people without sleep apnea.The results showed that this association was even higher in men and younger people.
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