Global burden of oral cancer in 2022 attributable to smokeless tobacco and areca nut consumption: a population attributable fraction analysis

Background Consuming products that contain smokeless tobacco or areca nut increases the risk of oral cancer. We aimed to estimate the burden of oral cancer attributable to smokeless tobacco or areca nut consumption globally and by type of smokeless tobacco or areca nut product in four major consuming countries. Methods We calculated population attributable fractions (PAFs) using prevalence of current use of smokeless tobacco or areca nut products from national surveys and corresponding risks of oral cancer from the literature. We applied PAFs to national estimates of oral cancer incidence in 2022 from the Global Cancer Observatory's Cancer Today database to obtain cases attributable to smokeless tobacco or areca nut consumption. We modelled 95% uncertainty intervals (UIs) using Monte Carlo simulations. Findings Globally, an estimated 120 200 (95% UI 115 300-124 300) cases of oral cancer diagnosed in 2022 were attributable to smokeless tobacco or areca nut consumption, accounting for 30<middle dot>8% (95% UI 29<middle dot>6-31<middle dot>9) of all oral cancer cases (120 200 of 389 800). An estimated 77% of attributable cases were among male patients (92 600 cases, 95% UI 88 000-96 500) and 23% were among female patients (27 600 cases, 26 000-29 000). Regions with the highest PAFs were Melanesia, Micronesia, and Polynesia (78<middle dot>6%, 95% UI 74<middle dot>4-80<middle dot>5), southcentral Asia (57<middle dot>5%, 54<middle dot>8-59<middle dot>5), and southeastern Asia (19<middle dot>8%, 19<middle dot>0-20<middle dot>6). Lower-middle-income countries represented 90<middle dot>2% of the world total attributable cases (108 400 cases, 95% UI 103 400-112 200). Interpretation Our findings suggest that one in three cases of oral cancer globally are attributable to smokeless tobacco or areca nut consumption, and could be prevented through smokeless tobacco and areca nut control. Global cancer control efforts must incorporate further measures to reduce smokeless tobacco and areca nut consumption in populations with the largest attributable burden. Funding French National Cancer Institute. Copyright (c) 2024 World Health Organization. Published by Elsevier Ltd. All rights reserved, including those for text and data mining, AI training, and similar technologies.