# Global cancer burden from infectious agents > Live situation record from CLSTR: https://clstr.news/situations/20260930-global-cancer-burden-from-infectious-agents > Updated: 2026-10-03T07:32:51.000Z. Sources: 81. Developments: 3. Research conducted by the International Agency for Research on Cancer (IARC) has established a significant link between infectious diseases and global cancer rates. An initial study published in The Lancet Oncology estimated that approximately 2.3 million new cancer cases in 2024—roughly 12% of all global diagnoses—were linked to infectious agents such as viruses, bacteria, and parasites. The data highlights significant geographic and economic disparities, noting that over 75% of these cases occur in low- and middle-income countries, with East Asia and Sub-Saharan Africa bearing the highest burdens. Subsequent reporting from the World Health Organization (WHO) expanded on these findings, noting that infectious diseases contributed to approximately one in eight cancer cases in 2024. The research analyzed 12 specific infections, including HIV, Kaposi’s sarcoma-associated herpesvirus, human T-cell lymphotropic virus type 1, Merkel cell polyomavirus, and various parasitic fluke worms. Notably, the bacterium Helicobacter pylori is estimated to be linked to 760,000 cases, representing 4% of all cancer cases in 2024. Further analysis of the IARC study clarifies that Human papillomavirus (HPV) was linked to approximately 750,000 cases, serving as the cause of more than 90 percent of cervical cancer cases. Specific pathogen breakdowns include Hepatitis B virus (HBV) with 360,000 cases, Epstein-Barr virus (EBV) with 260,000 cases, and Hepatitis C virus (HCV) with approximately 160,000 cases. These infections can contribute to more than 20 types of cancer, including those affecting the stomach, liver, cervix, and blood. Researchers emphasize that while these infections are significant drivers, many cases remain preventable or treatable through improved infection control, vaccination, and screening programs. ## Claims - Infection-related cancer cases accounted for roughly 12% of all global cancer diagnoses in 2024. (disputed by 11 sources) - Approximately one in eight cancer cases worldwide is linked to infections. (disputed by 4 sources) - Approximately 2.3 million new cancer cases in 2024 were linked to infectious agents. (corroborated by 11 sources) - A study published in The Lancet Oncology analyzed the global burden of cancer attributable to infections. (corroborated by 8 sources) - Helicobacter pylori was responsible for approximately 760,000 cancer cases. (corroborated by 5 sources) - Human Papillomavirus (HPV) was linked to approximately 750,000 cancer cases. (corroborated by 5 sources) - Hepatitis B virus (HBV) was linked to about 360,000 cancer cases. (corroborated by 5 sources) - Epstein-Barr virus (EBV) was linked to approximately 260,000 cancer cases. (corroborated by 5 sources) - The research was led by the International Agency for Research on Cancer (IARC). (corroborated by 5 sources) - Hepatitis C virus (HCV) was linked to approximately 160,000 cancer cases. (corroborated by 4 sources) - Low- and middle-income countries account for 77% of the global infection-related cancer burden. (corroborated by 3 sources) ## Timeline ### 2026-10-03: Infections linked to 2.3 million global cancer cases in 2024 A study in The Lancet Oncology reveals that infectious agents were linked to 2.3 million new cancer cases globally in 2024, representing about 12% of all diagnoses. 25 sources. https://clstr.news/cluster/infections-linked-to-1-in-8-global-cancer-cases-study-finds ### 2026-09-30: IARC study links one in eight cancer cases to infections An IARC study published in The Lancet Oncology finds that one in eight cancer cases worldwide is linked to infections, including HPV and Helicobacter pylori. 5 sources. https://clstr.news/cluster/infectious-diseases-linked-to-23-million-new-cancer-cases-in-2024 ### 2026-09-28: IARC study: Infections linked to 2.3 million new cancer cases in 2024 An IARC study reveals that 12% of new cancer cases in 2024, roughly 2.3 million, were caused by preventable infections, primarily driven by five key pathogens like H. pylori and HPV. 53 sources. https://clstr.news/cluster/infections-linked-to-23-million-cancer-cases-in-2024 --- Cite as: Global cancer burden from infectious agents. CLSTR, https://clstr.news/situations/20260930-global-cancer-burden-from-infectious-agents