Limitations of using 16S rRNA microbiome sequencing to predict oral squamous cell carcinoma

A new era of next‐generation sequencing has changed our perception of the oral microbiome in health and disease, and with this there is a growing understanding that the oral microbiome is a contributing factor to oral squamous cell carcinoma (OSCC), a malignancy of the oral cavity. This study aimed to analyse the trends and relevant literature based on the 16S rRNA oral microbiome in head and neck cancer using next‐generation sequencing technologies, and to conduct a meta‐analysis of the studies with OSCC cases and healthy controls. A literature search using the databases Web of Science and PubMed was conducted in a scoping‐like review to collect information based on the study design, and plots were generated using RStudio. We selected case–control studies using 16S rRNA oral microbiome sequencing analysis in OSCC cases versus healthy controls for re‐analysis. Statistical analyses were conducted using R. Out of 916 original articles, we filtered and selected 58 studies for review, and 11 studies for meta‐analysis. Differences between sampling type, DNA extraction methods, next‐generation sequencing technology and region of the 16S rRNA were identified. No significant differences in the α‐ and β‐diversity between health and oral squamous cell carcinoma were observed (p