Scientists discover the likely cause of one in eight cancers – and it's not smoking, diet or alcohol
A new study has analysed the frequency and causes of different cancers. Here’s what was found
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Read the original articleThe Independent · independent.co.ukOur verdict
Political lean
0 = center. The further from 0, the stronger the lean (max 10).
Reporting balance
How complete and even-handed the reporting is — separate from which side it leans.
This is a politically neutral science explainer summarizing WHO research that about one in eight cancers may be infection-related. Its strength is sourced numbers with context and clear mechanism and prevention background. Readers should keep in mind it relies on a single new study without independent expert critique, so the 12% estimate is best read as an attribution model, not a new proven cause.
- Why this lean
- The article contains no left/right framing, partisan sourcing, or political word choices; it reports a WHO cancer-infection study, explains biological mechanisms, and discusses vaccination and equity in low- and middle-income countries.
- Framing
- The story is told from a public-health science-explainer angle and treats the central question as how infections cause cancer and how prevention can reduce cases.
Key Findings
- 1Headline matches body: headline's one in eight equals body's Around 12% of the world's total cancer cases in 2024 were likely caused by an infection.
- 2Numbers are sourced and qualified: gives DOI link for Lancet Oncology study, pathogen percentages, and warns comparisons cannot really be made confidently due to changing data sources and quality.
- 3Explains mechanisms in neutral detail: three viral pathways including inactivating TP53/RB proteins, DNA insertion, and oncogenes, plus chronic inflammation for bacteria/parasites.
- 4Includes inconvenient context for its prevention angle: notes HPV vaccination fell from 85.7% to 79.5% and that access in poorer countries can be limited as a major equity issue.
- 5No partisan sourcing or loaded labels found: no political figures quoted, no left/right policy argument, and no scare quotes or emotive characterizations of groups.
Who gets a voice
No one is quoted or paraphrased in this article.
Dimension Breakdown
Relies on one primary source, the WHO study in The Lancet Oncology, plus established mechanism research and Australian vaccine data; no independent outside expert quoted.
Uses plain attributed scientific language throughout, with no emotive labels or speculative verbs observed.
Numbers are sourced with context, e.g. 2.3 million cases, pathogen breakdown, 90% HPV drop, and caution that year-to-year comparisons cannot really be made confidently.
Covers mechanisms, prevention, and equity, noting around 75% of infection-caused cancers were in low- and middle-income countries; no affected patient or dissenting scientific view included but none required for angle.
Headline's one in eight matches body's around 12% likely caused by an infection; it's not smoking, diet or alcohol is a contrast framing not directly tested in body.
Provides history of prior estimates, three viral mechanisms, bacterial/parasite pathway, and prevention context including vaccines, condoms and screening.
Missing Perspectives
- Independent oncologist or epidemiologist not involved in the study to assess methods, data quality, and attribution uncertainty.
- More detail on study limitations by region, given reliance on varying global cancer-registry data, which matters for interpreting the 12% global estimate.
Key Facts
- Around 12% of the world's total cancer cases in 2024 were likely caused by an infection, according to new WHO research
- The study, published in The Lancet Oncology, linked 2.3 million new cancer cases to an infection
- Most were caused by five pathogens: Helicobacter pylori (4%), HPV (4%), hepatitis B (2%), Epstein-Barr virus (1%) and hepatitis C (under 1%), according to the article
- Previous work in this field investigated cases in 1990, 2002, 2008, 2012 and 2018, with a high of 18% in 2002, according to the authors
- Since Australia's HPV vaccination program began in 2007, HPV infections dropped by 90% among eligible people, according to the article
- Vaccination rates among 15-year-olds in Australia fell from 85.7% in 2020 to 79.5% in 2024, according to the article
- Around 75% of cancers caused by infections were found in low- and middle-income countries, according to the new study
