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Just Correlation: Sleep Apnea And Cancer Risk
There is correlation between that and obesity, diabetes, cigarettes, and alcohol. There is no plausible biological mechanism for why those would cause sleep apnea, it is just correlation - epidemiologists look at rows of inputs and columns of effects - and that is the problem with a new paper claiming a link to cancer.
https://www.science20.com/news_staff/just_correlation_sleep_apnea_and_cancer_risk-256224