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

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

  3. Cancer - World Health Organization (WHO)

  4. Cancer - Symptoms and causes - Mayo Clinic

  5. Cancer - Wikipedia

  6. Cancer - World Health Organization (WHO)

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

  8. Comprehensive Cancer Information - NCI

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

  10. What is cancer? | Cancer Research UK