WHO: 7.1 million cancer cases globally preventable, tobacco biggest risk

New Delhi: Up to four in 10 or 7.1 million cancer cases worldwide could be prevented, according to a new global analysis from the World health Organization (WHO) and its International Agency for Research on Cancer (IARC) on Wednesday. 

The study, released on World Cancer Day on February 4, identified tobacco as the leading preventable cause of cancer globally, responsible for 15 per cent of all new cancer cases.

It also found, for the first time, that nine cancer-causing infections are responsible for about 10 per cent of cancer cases.

Other reasons include alcohol, high body mass index, physical inactivity, air pollution, and ultraviolet radiation.

The analysis, based on data from 185 countries and 36 cancer types, estimated that 37 per cent of all new cancer cases in 2022, around 7.1 million cases, were linked to preventable causes. 

Three cancer types - lung, stomach and cervical cancer- accounted for nearly half of all preventable cancer cases in both men and women, globally.

Lung cancer was primarily linked to smoking and air pollution, stomach cancer was largely attributable to Helicobacter pylori infection, and cervical cancer was overwhelmingly caused by human papillomavirus (HPV).

"This is the first global analysis to show how much cancer risk comes from causes we can prevent," said Dr Ilbawi, WHO Team Lead for Cancer Control, and author of the study. 

"By examining patterns across countries and population groups, we can provide governments and individuals with more specific information to help prevent many cancer cases before they start," he added.

The burden of preventable cancer was substantially higher in men than in women, with 45 per cent of new cancer cases in men compared with 30 per cent in women. 

In men, smoking accounted for an estimated 23 per cent of all new cancer cases, followed by infections at 9 per cent and alcohol at 4 per cent. 

Among women globally, infections accounted for 11 per cent of all new cancer cases, followed by smoking at 6 per cent and high body mass index at 3 per cent, the report said.

The findings underscore the need for context-specific prevention strategies that include strong tobacco control measures, alcohol regulation, vaccination against cancer-causing infections such as human papillomavirus (HPV) and hepatitis B, improved air quality, safer workplaces, and healthier food and physical activity environments.

Addressing preventable risk factors not only reduces cancer incidence but also lowers long-term health care costs and improves population health and well-being, the study said.