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  1. What are the causes of cancer? - Cancer Research Institute

  2. Cancer - World Health Organization (WHO)

  3. Cancer - Symptoms and causes - Mayo Clinic

  4. Cancer Facts and Statistics | American Cancer Society

  5. Cancer: Causes and Risk Factors - Verywell Health

  6. Cancer Causes and Prevention - NCI - National Cancer Institute

  7. Cancer Facts & Figures 2021 | American Cancer Society

  8. Chronic Disease Fact Sheet: Cancer | CDC

  9. Cancer - Our World in Data

  10. Cancer - World Health Organization (WHO)