4 in 10 Cancers Are Preventable, New Global Study Shows

Scientists just delivered some of the most hopeful cancer news in years: four in 10 cancer cases worldwide are completely preventable.

Researchers from the World Health Organization analyzed 30 cancer risk factors across 185 countries and found that 7.1 million of the 18.7 million new cancer cases diagnosed in 2022 could have been avoided. In the UK alone, more than 148,000 cases were linked to preventable causes.

The findings aren't about blame. They're about power. "Today, we are here to celebrate good news founded on strong science," says Dr. Andre Ilbawi, WHO team lead for cancer control. "Many cancers are preventable."

The study identified the top preventable risk factors: tobacco smoking leads the pack at 16.2% of UK cases, followed by excess body weight at 4.2%, and ultraviolet radiation from sun and sunbeds at 3.6%. Alcohol consumption rounds out the major culprits at 3.3%.

For smokers, the opportunity for change is enormous. Up to 79% of lung cancer cases in the UK are preventable, with cigarette smoke containing over 5,000 chemicals and 70 known carcinogens that damage DNA throughout the body.

The weight loss revolution happening right now could play a surprising role. Around 1.6 million Britons used medications like Wegovy and Mounjaro last year, and emerging research suggests these drugs may have anti-cancer effects beyond simply helping people lose weight by reducing inflammation in the body.

Even sun safety is getting a policy upgrade. The UK government is strengthening sunbed regulations as part of the National Cancer Plan, including banning unsupervised sessions and introducing mandatory ID checks to keep under-18s safe. These measures target a real threat: using sunbeds before age 20 increases melanoma risk by 47%.

The Ripple Effect

The implications extend far beyond individual health choices. When governments invest in cancer prevention through policy changes like smoke-free laws, sunbed regulations, and accessible healthcare, entire populations benefit. The economic savings from preventing cancer free up resources for other health priorities while reducing the emotional toll on families.

Dr. Ilbawi emphasizes that prevention must focus on "policy and structural solutions" rather than personal blame. This means creating environments where healthy choices become easier: cleaner air, safer sun protection access, and support systems for quitting smoking or maintaining healthy weight.

The message is clear and empowering: millions of future cancer cases don't have to happen.