Cancer under age 50 increased 80% from 1990 to 2019

Original Article ↗ Hacker News Discussion ↗

Study framing & headline concerns

  • Several commenters note the headline “80% increase” uses absolute case counts, not population-adjusted rates.
  • Population in key age bands (15–49 and especially 40–49) grew substantially over the period, which could explain much of the raw increase.
  • Responses cited in the journal argue: age-specific and age-standardized incidence and mortality show no clear increase since the mid‑1990s, while mortality has declined.
  • Some call this “bad science communication” and a failure by editors for allowing a headline anchored on absolute numbers.

Incidence vs mortality & treatment

  • Figures in the paper show early-onset cancer deaths rising modestly (~800k to ~1M) while population grew faster, suggesting per‑capita mortality is flat or down.
  • Age-adjusted death rates reportedly decreased “dramatically” for both genders, while incidence rates rose only marginally.
  • Many infer: increased detection and improved treatment are the main drivers, not necessarily a surge in underlying disease risk.
  • Others caution that earlier detection lowering mortality doesn’t by itself prove incidence hasn’t increased.

Geographic patterns & development

  • Map/figure discussions note large incidence increases in parts of South America and Africa, with flat or declining rates in many high‑income countries.
  • Explanations offered:
    • Better access to healthcare and diagnostics in developing regions revealing previously undiagnosed cancers.
    • Fewer deaths from infectious disease and malnutrition, so more people live long enough to get diagnosed with cancer.
    • Industrialization, pollution, and dietary shifts toward “Western” or ultra‑processed foods.

Environment, lifestyle, and risk factors

  • Multiple comments worry about plastics, microplastics, PFAS, trash burning, pesticides, and industrial pollution, invoking the precautionary principle.
  • Others counter that many pollution measures in the West have improved and that media (and this study’s framing) can exaggerate risk perceptions.
  • The paper’s own conclusion (as quoted) emphasizes diet (red meat, low fruit/milk, high sodium), alcohol, and tobacco as main modifiable risk factors, and advocates healthier lifestyles.

Medicine, prevention, and broader skepticism

  • Some see frustratingly slow progress in cancer cures; others are optimistic about a shift from “science” to “engineering” in biomedicine (PCR, mRNA).
  • Several threads debate overdiagnosis, screening, antibiotic overuse, autoimmunity, and trust in doctors and pharmaceuticals.
  • A minority raise unsubstantiated links (e.g., RF exposure, COVID vaccines) as possible contributors; these claims are not resolved within the discussion.