Up to four in ten cancer cases worldwide – that’s roughly 7 million diagnoses in 2022 alone – could be prevented, according to a groundbreaking analysis released in 2026 by the World Health Organization (WHO) and its International Agency for Research on Cancer (IARC). The study, which examined data from 185 countries and 36 different cancer types, identifies a range of modifiable risk factors contributing to the global cancer burden, offering a path toward significant reductions in incidence through targeted prevention strategies.
The analysis reveals that lung, stomach, and cervical cancers account for nearly half of all preventable cancer cases globally. While cancer remains a leading cause of death worldwide, these findings underscore the powerful impact of addressing preventable risk factors, from lifestyle choices to environmental exposures. This isn’t simply about individual behavior; it’s about creating conditions that make healthy choices easier and more accessible for everyone.
The study pinpointed 30 preventable causes of cancer, including well-established factors like tobacco use and alcohol consumption, as well as increasingly recognized contributors such as high body mass index (BMI), physical inactivity, air pollution, ultraviolet radiation, and nine specific cancer-causing infections. André Ilbawi, WHO Team Leader for Cancer Control and an author of the study, emphasized the significance of this comprehensive approach, stating, “This is the first global analysis to show how much cancer risk comes from causes we can prevent. By examining patterns across countries and population groups, we can provide governments and individuals with more specific information to help prevent many cancer cases before they start.”
Leading Preventable Causes and Cancer Types
The research estimates that 37% of all new cancer cases in 2022 – exceeding 7 million – were linked to preventable causes. Tobacco emerged as the single largest preventable risk factor, responsible for 15% of all new cancer cases globally. Infections followed closely behind, accounting for 10%, while alcohol consumption contributed to 3%. These figures highlight the urgent require for continued and expanded public health interventions focused on these key areas.
The link between specific risk factors and cancer types is also clearly defined. Lung cancer is strongly associated with both smoking and exposure to air pollution, while stomach cancer is largely attributable to infection with Helicobacter pylori. Cervical cancer, meanwhile, is substantially caused by the human papillomavirus (HPV). Understanding these connections is crucial for developing effective prevention programs.
Gender Disparities in Preventable Cancer Burden
The burden of preventable cancer differs significantly between men and women. 45% of new cancer cases in men are linked to preventable factors, compared to 30% in women. Among men, smoking is the dominant preventable cause, accounting for an estimated 23% of all new cases, followed by infections (9%) and alcohol (4%). For women, infections are a more prominent risk factor, contributing to 11% of new cases, followed by smoking (6%) and high BMI (3%). These disparities underscore the need for gender-specific prevention strategies.
Regional Variations and Socioeconomic Factors
The prevalence of preventable cancers varies considerably across different regions of the world. In women, preventable cancers range from 24% in North Africa and West Asia to 38% in sub-Saharan Africa. Among men, the highest burden is found in East Asia, at 57%, while the lowest is in Latin America and the Caribbean, at 28%. Researchers attribute these regional differences to varying levels of exposure to behavioral, environmental, occupational, and infectious risk factors, as well as differences in socioeconomic development, national prevention policies, and the capacity of health systems.
These findings suggest that a one-size-fits-all approach to cancer prevention is unlikely to be effective. Strategies must be tailored to the specific risk factors and challenges faced by each region and population group. For example, regions with high rates of smoking may prioritize tobacco control measures, while those with high rates of infectious diseases may focus on vaccination programs.
The Path Forward: Coordinated Action for Cancer Prevention
Isabelle Soerjomataram, Deputy Head of the IARC Cancer Surveillance Unit and senior author of the study, emphasized the potential impact of addressing these preventable causes, stating, “Addressing these preventable causes represents one of the most powerful opportunities to reduce the global cancer burden.” The study’s authors call for coordinated, cross-sector action to prevent millions from experiencing a cancer diagnosis, lower long-term healthcare costs, and improve overall population health and wellbeing.
Effective prevention strategies require a multi-faceted approach, including strong tobacco control measures, regulation of alcohol consumption, widespread vaccination against cancer-causing infections, improved air quality, safer workplaces, and environments that promote healthy food choices and physical activity. This necessitates collaboration between governments, healthcare providers, researchers, and communities.
The IARC, as part of the World Health Organization, continues to monitor global cancer trends and provide evidence-based recommendations for prevention and control. Further research is planned to refine our understanding of the complex interplay between risk factors and cancer development, and to identify new opportunities for intervention. The full study, “Global and regional cancer burden attributable to modifiable risk factors to inform prevention,” was published in Nature Medicine in 2026 (DOI:10.1038/s41591-026-04219-7).
The next major checkpoint in this ongoing effort will be the release of updated guidelines on cervical cancer screening at the EUROGIN 2026 conference, presented by IARC scientists, building on the momentum of this landmark analysis of preventable cancer cases.
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