About half of cancer deaths worldwide are preventable, according to an analysis published in The Lancet and summarized in Nature.
Using estimates of cancer cases and deaths from more than 200 countries, researchers found that avoidable risk factors were responsible for nearly 4.5 million cancer deaths in 2019 (see ‘Global cancer deaths’). That represents more than 44% of global cancer deaths that year. Smoking, alcohol use and a high body-mass index (BMI) — which can be indicative of obesity — were the biggest contributors to cancer.