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  1. Cancer - NHS

  2. Cancer - World Health Organization (WHO)

  3. What Is Cancer? - NCI - National Cancer Institute

  4. Cancer - Wikipedia

  5. Cancer - Symptoms and causes - Mayo Clinic

  6. Cancer - Signs and symptoms - NHS

  7. What is cancer? | Cancer Research UK

  8. Cancer: Types, Causes, Treatment, and Prevention - Healthline

  9. About Cancer | Cancer Research UK

  10. Cancer - World Health Organization (WHO)

  11. Cancer signs and symptoms | Cancer Research UK

  12. What is Cancer? | Cancer Basics | American Cancer Society

  13. What is Cancer? | Cancer.Net

  14. Comprehensive Cancer Information - NCI

  15. Cancer | Definition, Causes, Types, & Treatment | Britannica

  16. What Is Cancer? Symptoms, Signs, Types & Causes - Cleveland Clinic

  17. Understanding Cancer - NCI

  18. Information and Resources about Cancer: Breast, Colon, Lung, …

  19. Causes of cancer | How to reduce the risk of cancer - Cancer Research UK

  20. What is cancer? | Cancer Council

  21. Prostate cancer - NHS

  22. About Cancer - NCI

  23. Cancer - Wiley Online Library