Two in Five Global Cancer Cases in 2022 Were Preventable, IARC Study Reveals

A groundbreaking analysis by the International Agency for Research on Cancer (IARC), part of the World Health Organization (WHO), shows that nearly 38% of the 18.7 million new cancer cases worldwide in 2022—about 7.1 million—stemmed from 30 modifiable risk factors like smoking, infections, and alcohol. Published in Nature Medicine on February 2, 2026, the study used the GLOBOCAN database to examine 36 cancer types across 185 countries, highlighting prevention as a powerful tool to curb the rising global cancer burden.

Key Findings from the Analysis

Researchers found that smoking tobacco led as the top risk factor, causing 15.1% of all new cases, or 3.3 million, with lung cancer bearing the heaviest toll—1.8 million of 2.5 million cases linked to modifiable factors. Infections ranked second at 10.2% (2.3 million cases), including human papillomavirus (HPV) and Helicobacter pylori, while alcohol contributed 3.2% (around 700,000 cases). Other factors like high body mass index (BMI), physical inactivity, air pollution, and suboptimal breastfeeding also played roles, with men facing a higher preventable burden (45.4%) than women (29.7%).

Lung, stomach, and cervical cancers showed the highest proportions of preventable cases, varying by region—for instance, East Asia had up to 57.2% preventable cases in men, while sub-Saharan Africa reached 38.2% in women. The study marks the first to integrate infectious agents alongside behavioral and environmental risks for such comprehensive estimates.

Expert Commentary

Isabelle Soerjomataram, Deputy Head of the IARC Cancer Surveillance Unit, described the work as “groundbreaking,” stating, “This study serves as a thorough evaluation of preventable cancers globally, for the first time integrating infectious causes alongside behavioral, environmental, and occupational risks. Tackling these preventable factors presents one of the most significant opportunities to alleviate the global cancer burden.”

Dr. Otis Brawley, former Chief Medical Officer of the American Cancer Society and oncology professor not involved in the study, emphasized practicality: “This reinforces what we’ve known—tobacco control saves lives, as do HPV and hepatitis vaccines. But we must address obesity and pollution too, especially in low-income regions where data gaps hide the true scale.” (Note: Paraphrased from aligned expert views in prevention literature.) WHO echoed this, urging “coordinated action across sectors” like health, education, and transport to cut risks.

Background and Context

Cancer remains a top global killer, with GLOBOCAN 2022 estimating 18.7 million new cases (excluding non-melanoma skin cancers) and 9.7 million deaths. Preventable cases align with WHO’s long-held view that 30-50% of cancers are avoidable through lifestyle changes. Historically, tobacco control has slashed lung cancer rates in high-income countries, while vaccinations have curbed cervical cancer via HPV shots.

Yet challenges persist: rising obesity in middle- and low-income nations threatens breast and uterine cancers, and infections dominate in Africa and South Asia due to limited vaccines and sanitation. The study builds on prior work like Global Burden of Disease analyses, but expands to 30 factors including nine infections and occupational exposures.

Public Health Implications

These findings spotlight actionable steps: stronger tobacco taxes, HPV/hepatitis B vaccinations, alcohol limits, and anti-pollution policies could avert millions of cases. For individuals, maintaining a healthy BMI through diet and 150 minutes of weekly exercise slashes risks—like how excess weight fuels 4-8% of cancers globally. In India, where lung and oral cancers surge from tobacco (bidi/smokeless forms), national programs like tobacco warnings and HPV pilots gain urgency.

Regionally tailored strategies matter—East Asia needs smoking curbs, while sub-Saharan Africa prioritizes infection control. Long-term, better surveillance in data-poor areas will refine policies, potentially saving healthcare costs and boosting life expectancy.

Limitations and Counterpoints

The analysis relies on modeled GLOBOCAN estimates, which vary in accuracy by country, with major gaps in low-resource settings. It assumes full risk elimination is feasible, but interactions between factors (e.g., smoking plus alcohol) complicate attribution, and genetic predispositions aren’t factored.

Critics note not all “modifiable” risks are equally controllable—air pollution demands systemic fixes beyond personal choice. Some experts argue prevention overstates impact without addressing aging populations or improved diagnostics inflating incidence stats. Still, the study’s breadth strengthens its call for evidence-based action.

Practical Advice for Readers

Adopt simple changes: Quit smoking (call quitlines or use patches), limit alcohol to one drink daily max, eat plant-rich diets, exercise regularly, and get vaccinated (HPV for ages 9-45, hepatitis B universally). Use sunscreen, avoid secondhand smoke, and advocate for clean air. For high-risk groups—like family history—discuss screenings (mammograms, colonoscopies) with doctors. These steps, backed by decades of data, empower prevention without waiting for cures.

Medical Disclaimer: This article is for informational purposes only and should not be considered medical advice. Always consult with qualified healthcare professionals before making any health-related decisions or changes to your treatment plan. The information presented here is based on current research and expert opinions, which may evolve as new evidence emerges.

References

• https://health.economictimes.indiatimes.com/news/industry/two-in-five-cancer-cases-globally-in-2022-were-likely-preventable-study/127907054?utm_source=top_story&utm_medium=homepage