Up to 70% of Cancers Preventable: Major New Global Analysis Reveals
A groundbreaking global analysis suggests that up to 7 million cases of cancer could be prevented each year. The findings, released by scientists with the World Health Organization (WHO), estimate that 37% of all cancers are attributable to factors that are potentially avoidable – including infections, lifestyle choices and environmental pollution.
A Preventable Burden
Researchers describe the report as presenting a “great opportunity” to alter the course of millions of lives. While some cancers are unavoidable – stemming from DNA damage with age or inherited genetic predispositions – Dr. Isabelle Soerjomataram noted that the fact that nearly four in ten cancers are preventable is “quite a substantial proportion,” a revelation that often surprises people.
Key Risk Factors Identified
The International Agency for Research on Cancer (IARC), under the WHO, analyzed 30 known cancer risk factors that are preventable. These include direct DNA damage from smoking and ultraviolet (UV) radiation, altered inflammatory responses and hormonal shifts linked to obesity and physical inactivity, and the potential to activate dormant cancer cells through air pollution.
The analysis used 2022 global cancer data alongside 30 cancer risk factors from 185 countries, assessed a decade prior. The three leading factors contributing to cancer cases worldwide were identified as smoking (3.3 million cases), infections (2.3 million cases), and alcohol consumption (700,000 cases).
Gender and Geographic Disparities
The report revealed significant differences in cancer prevention potential based on gender. Approximately 45% of cancers in men are preventable, compared to 30% in women, partly due to higher smoking rates among men. Regional variations also exist; in Europe, the top three preventable causes of cancer for women are smoking, infection, and obesity. However, in sub-Saharan Africa, infections account for around 80% of preventable cancers in women.
This underscores the need for tailored approaches to cancer prevention, recognising that strategies must be adapted to specific regions and countries.
The report, published in Nature Medicine, highlights that lung cancer (linked to smoking and air pollution), stomach cancer (linked to H. Pylori infection), and cervical cancer (linked to HPV infection) account for nearly half of all preventable cancer cases.
Dr. Andre Ilbawi, WHO’s cancer control programme manager, described the study as “good news,” emphasizing that it points to concrete actions that can be taken. He noted that countries implementing smoke-free policies or HPV vaccination programs have already seen positive results. “The proportion of preventable cancers can change over time, and our goal is to get it as close to zero as possible,” he stated.
Frequently Asked Questions
What percentage of cancers are potentially preventable?
According to the report, 37% of all cancers are attributable to factors that are potentially avoidable.
What are the three leading factors contributing to cancer cases globally?
The three leading factors are smoking (3.3 million cases), infections (2.3 million cases), and alcohol consumption (700,000 cases).
Are there differences in cancer prevention potential between men and women?
Yes, approximately 45% of cancers in men are preventable, compared to 30% in women, partly due to higher smoking rates among men.
Given these findings, what steps do you think are most crucial for individuals and communities to take in reducing their risk of developing cancer?