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  1. What Is Cancer? - NCI

    Oct 11, 2021 · Explanations about what cancer is, how cancer cells differ from normal cells, and genetic changes that cause cancer to grow and spread.

  2. Cancer - Wikipedia

    The cancers causing the most deaths, as of 2020 are lung cancer (1.8 million), colorectal cancer (916,000), liver cancer (830,000), stomach cancer (769,000) and breast cancer (685,000). [2]

  3. Cancer - World Health Organization (WHO)

    Apr 16, 2026 · WHO fact sheet on cancer providing information on the health burden of different types of cancer, causes, risk factors, prevention, early diagnosis, treatment, palliative care, and WHO's work …

  4. All About Cancer - American Cancer Society

    Learn about cancer at the American Cancer Society. Find information for specific cancer types: breast, colon, lung, prostate, skin, and more.

  5. Cancer - Symptoms and causes - Mayo Clinic

    Nov 19, 2024 · Find out the basics about cancer, including symptoms, causes and treatments. Learn steps you can take to prevent cancer.

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

    Aug 19, 2024 · Having cancer is a life-changing event. Knowing what to expect — from diagnosis to recovery — can empower you and help you take control of your health. This is a general overview of …

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

    Jun 18, 2026 · Cancer is a disease characterized by the uncontrolled multiplication of abnormal cells in the body. There are numerous types of cancers, with certain types being major causes of sickness …