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

  2. Cancer - World Health Organization (WHO)

  3. Cancer - Wikipedia

  4. Cancer - Symptoms and causes - Mayo Clinic

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

  6. Cancer - World Health Organization (WHO)

  7. Cancer - Wiley Online Library

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

  9. Comprehensive Cancer Information - NCI

  10. Understanding Cancer - NCI