The Genetic Footprint of Tobacco Smoking: Unraveling the Mutational Signatures in Head and Neck Cancer.

Abstract

Tobacco smoking and alcohol consumption are among the most significant, yet preventable, behavioral risk factors for cancer. In a recent article in Nature Genetics, Torrens and colleagues performed whole-genome sequencing of 265 head and neck cancer samples collected from 8 countries across Europe and South America. They investigated the mechanisms underlying head and neck cancer development using mutational signature analysis and driver mutation analysis, complemented by regression analysis with epidemiologic data. Although the analyses confirmed the established roles of tobacco smoking and alcohol consumption as the primary causes of head and neck cancer, key findings included the synergistic effect of tobacco smoke and alcohol consumption, revealing that alcohol-induced mutational burden was significantly higher when combined with tobacco smoking. Additionally, the difference in smoking habits between countries was identified as a direct contributor to regional differences in head and neck cancer incidence. Furthermore, a novel smoking-related mutational signature, SBS_I, was discovered, awaiting further investigation into the underlying mutational process. This genomics-driven work by Torrens and colleagues evokes further research interest with regard to the precise mechanisms of tumor initiation and promotion and in the field of public health measures. In the end, Torrens and colleagues conclude with a call for antismoking measures, emphasizing the need to combat this major cancer risk factor.