About 2.3 million cancer cases worldwide in 2024, or roughly 12% of the global total, were linked to infections, according to a study by the International Agency for Research on Cancer published in The Lancet Oncology.
Five pathogens—Helicobacter pylori, human papillomavirus (HPV), hepatitis B and C viruses (HBV and HCV), and Epstein-Barr virus (EBV)—accounted for nearly all infection-related cancers identified in the study. Researchers said these infections can interfere with cellular processes that normally help prevent cancer development.
About three-quarters of infection-linked cancer cases occurred in low- and middle-income countries, with Eastern Asia accounting for about 42% of the global total.
One researcher said the estimates may be conservative, suggesting the actual number of infection-related cancers could be higher.
Related Tweet:
‘A major global challenge’: New research finds 1 in 8 cancer cases caused by infections https://t.co/rVbDQx6AND
— CTV News (@CTVNews) October 1, 2026
Also Read:

