Infections Linked to One in Eight New Cancer Cases Worldwide

Around one in eight new cancer cases worldwide is linked to an infection, according to a global study highlighting the role of viruses and bacteria in the disease.

The study puts the number of infection-associated cancer cases recorded in 2024 at 2.3 million. Five viral and bacterial agents account for most of that total.

The findings draw attention to an aspect of cancer prevention that can receive less attention: reducing the burden of infections linked to the disease.

Some of those infections can be prevented through vaccination or addressed with treatment, offering opportunities to reduce the risk of cancers associated with them.

The figures describe cancer cases linked to infections, not cancers that are themselves contagious. They underscore why infection prevention and treatment matter alongside other efforts to curb cancer worldwide.