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  1. Cancer - Symptoms and causes - Mayo Clinic

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

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

  4. A to Z List of Cancer Types - NCI - National Cancer Institute

  5. What Is Cancer? | Cancer Basics | American Cancer Society

  6. Cancer - Wikipedia

  7. Cancer - World Health Organization (WHO)

  8. All About Cancer - American Cancer Society

  9. Understanding Cancer - NCI

  10. Cancer causes: Popular myths about the causes of cancer