Up to 40% of Cancer Cases Are Preventable: New WHO Study

A new global analysis reveals that up to 37% of all cancer cases – approximately 7.1 million diagnoses in 2022 – may be linked to preventable causes. The study, drawing on data from 185 countries and 36 cancer types, identifies 30 factors contributing to cancer risk, including, for the first time, nine cancer-causing infections.

The Scale of Preventable Cancer

The analysis highlights the significant potential for reducing the global cancer burden through preventative measures. Researchers identified tobacco use as the leading preventable cause, responsible for 15% of all new cancer cases worldwide. Infections account for 10% and alcohol consumption for 3%.

Key Cancer Types Linked to Preventable Causes

Lung, stomach, and cervical cancers collectively represent nearly half of all preventable cancer cases globally. Lung cancer is primarily associated with smoking and air pollution. Helicobacter pylori infection is largely attributable to stomach cancer, while human papillomavirus (HPV) is overwhelmingly the cause of cervical cancer.

Did You Know? This is the first global analysis to quantify the proportion of cancer risk stemming from preventable causes.

Disparities in Cancer Prevention

The burden of preventable cancer differs significantly between men and women. Approximately 45% of new cancer cases in men are linked to preventable factors, compared to 30% in women. Among men, smoking accounts for an estimated 23% of all new cancer cases. Among women, infections are the leading preventable cause, accounting for 11% of cases.

Regional variations are also substantial. Preventable cancers range from 24% in North Africa and West Asia to 38% in sub-Saharan Africa among women. For men, the highest burden is observed in East Asia at 57%, and the lowest in Latin America and the Caribbean at 28%. These differences reflect varying exposures to risk factors and differences in healthcare infrastructure.

Expert Insight: Identifying these patterns across countries and populations allows for more targeted prevention strategies, potentially maximizing the impact of public health initiatives.

What Could Happen Next

Governments may prioritize strengthening tobacco control measures and implementing more robust alcohol regulations. Increased investment in vaccination programs targeting cancer-causing infections, such as HPV and hepatitis B, is also a possible next step. Improved air quality initiatives and safer workplace standards could also be implemented.

A coordinated, multi-sectoral approach – involving health, education, energy, transport, and labor – could potentially prevent millions of cancer diagnoses. Addressing these preventable risk factors may also lead to reduced long-term healthcare costs and improved overall population health.

Frequently Asked Questions

What percentage of cancer cases are potentially preventable?

Up to 37% of all new cancer cases in 2022, around 7.1 million cases, were linked to preventable causes.

What is the leading preventable cause of cancer globally?

Tobacco use is the leading preventable cause of cancer, globally responsible for 15% of all new cancer cases.

Which three cancer types account for nearly half of all preventable cancer cases?

Lung, stomach, and cervical cancer account for nearly half of all preventable cancer cases in both men and women, globally.

Considering the significant proportion of cancers linked to preventable factors, what role do you believe individual lifestyle choices play in mitigating cancer risk?