A startling new analysis from the International Agency for Research on Cancer has revealed that roughly one in eight new cancer cases worldwide are linked to infections. According to the study published in The Lancet Oncology, approximately 2.3 million cases in 2024 were attributed to infectious agents. While most cancers are not caused by viruses or bacteria, researchers identified twelve specific infections that drive these numbers, with five primary culprits accounting for the vast majority of the global burden.
Among the leading causes are Helicobacter pylori, which is closely tied to gastric cancers, and Human Papillomavirus (HPV), a frequent driver of cancers affecting the cervix, vagina, and throat. Hepatitis B and C, along with the Epstein Barr virus, also contribute significantly to the totals. Experts note that while these figures seem daunting, they highlight a critical opportunity for prevention. Many of these malignancies could be avoided entirely through timely vaccinations, routine screenings, and proper medical treatment of the initial infections.
Dr. Harriet Rumgay, a scientist with the agency and co author of the study, pointed out that despite advancements in healthcare, infection related cancers remain a massive challenge globally. This burden falls particularly hard on people living in low and middle income countries where access to preventative care may be limited. However, she emphasized that strengthening infection control measures could drastically reduce the overall number of cancer diagnoses worldwide.
Medical professionals urge caution against panic, noting that contracting one of these infections does not guarantee a cancer diagnosis. For instance, many people carry HPV or H. pylori without ever developing a serious illness because their immune systems clear the infection naturally. Nevertheless, doctors recommend staying vigilant about symptoms like abnormal bleeding or persistent abdominal pain and encourage adults under 45 who haven’t been vaccinated against HPV to speak with their providers about protection.
