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  1. Cancer - Wikipedia

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

  3. Cancer - Symptoms and causes - Mayo Clinic

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

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

  6. Comprehensive Cancer Information - NCI

  7. All About Cancer | American Cancer Society

  8. Cancer - World Health Organization (WHO)

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

  10. Understanding Cancer - NCI