A narrative review of the relationship between head and neck cancer and obstructive sleep apnea: Clinical studies and statistical analysis.

Obstructive sleep apnea (OSA) is an underestimated and overlooked comorbidity in head and neck cancer (HNC) care. Refining HNC-OSA management requires an improved grasp of the HNC-OSA relationship. Thus, this paper reviews the current course of HNC therapy, causal and associative relationships before and after treatment, and statistical methods quantifying HNC-OSA interactions. This evaluation serves a dual purpose: to support oncologists and sleep physicians in improving the treatment outcomes of patients undergoing HNC treatment by considering OSA as a comorbidity and to assist researchers in selecting suitable analytical models for investigating the correlation between OSA and HNC. The investigation confirms a positive correlation between the apnea-hypopnea index (AHI) and primary tumor size, consistent with prior findings. Case studies also reported new evidence of lipoma and head-neck tumors triggering OSA, and sleep apnea surgery prompting tumor development. This paper provides an overview of existing statistical models and offers suggestions for model selection and a framework for designing experiments that delve into research questions surrounding the link between OSA and HNC across various stages of cancer treatment. Despite progress, understanding the HNC-OSA interplay remains incomplete due to limited histological, molecular, and clinical data. Future studies with longitudinal data are crucial for comprehensive insights.