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Top Three Most Common Cancers Worldwide (2020): Lung, Breast, Colorectal

According to GLOBOCAN 2020 (IARC/WHO), the most frequently diagnosed cancers globally were:

  1. Breast cancer: 2.26 million new cases (11.7% of all cancers). Leading in women; #1 overall incidence.
  2. Lung cancer: 2.21 million (11.4%). Leading cause of cancer death (1.8M deaths).
  3. Colorectal cancer: 1.93 million (10.0%). Second leading cause of death (935K deaths).

Additional Context

  • Sex differences: Men: Lung, prostate, colorectal. Women: Breast, colorectal, lung.
  • Mortality ranking: 1. Lung, 2. Colorectal, 3. Liver, 4. Stomach, 5. Breast.
  • Trends: Breast and colorectal rising in transitioning economies; lung declining in men in high-income countries (tobacco control).
  • Preventable fractions: ~40% of cancers attributable to modifiable risks (tobacco, alcohol, diet, inactivity, infections, occupational).

Screening Impact

  • Breast: Mammography reduces mortality 20–40% (50–74 yrs).
  • Colorectal: Colonoscopy/FIT reduces incidence and mortality.
  • Lung: LDCT for high-risk smokers reduces mortality 20–24%.

Incidence reflects both risk and detection. Mortality reflects lethality and access to treatment. Both metrics are essential for cancer control planning.

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