Summary of a systematic literature review of Positive Airway Pressure device use and cancer risk.
Philips Respironics engaged external scientific experts to perform an independent systematic literature review of epidemiological studies to evaluate whether use of Continuous or Bilevel Positive Airway Pressure (PAP) devices increases the risk of cancer in obstructive sleep apnea (OSA) patients. 

Based on 13 epidemiological studies identified from the systematic literature review, no association has been established between use of PAP devices, including Philips Respironics PAP devices, and risk of cancer in patients with OSA. Two rigorous independent studies showed no statistical difference in cancer risk between OSA patients who used Philips Respironics PAP devices versus other brands of PAP devices. Eleven other epidemiological studies provided little additional insight into this question, but their results generally suggested no excess risk of cancer associated with PAP use for OSA.