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  1. Dictionary
    Can·cer
    /ˈkansər/
    • 1. a constellation (the Crab), said to represent a crab crushed under the foot of Hercules. It is most noted for the globular star cluster of Praesepe (the Beehive cluster).
    • 2. the fourth sign of the zodiac, which the sun enters at the northern summer solstice (about June 21).

    noun

    • 1. a person born when the sun is in the sign of Cancer.

    adjective

    • 1. used with preceding Greek letter or numeral to designate a star in the constellation Cancer: "the star Delta Cancri"
    More Definitions, Word Origin & Scrabble

  2. www.aacr.org › patients-caregivers › about-cancerWhat Is Cancer? | Patients and Caregivers | AACR

    Cancer is a group of diseases characterized by the uncontrolled proliferation of cells. Ignoring the body’s signal to stop, malignant cells multiply to form tumors in organs and tissues or, in the case of blood cancers, crowd out normal cells in the blood stream and bone marrow. What Causes Cancer?

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  4. www.cancer.org › cancer › understanding-cancerUnderstanding Cancer | What Is Cancer? | American Cancer Society

    Cancer is more than just one disease. There are many types of cancer, and it can develop anywhere in the body. Learn more about what cancer is, how it starts, and why it can be hard to cure.

  5. www.hopkinsmedicine.org › cancerOverview of Cancer | Johns Hopkins Medicine

    Cancer is a condition where cells multiply. But this multiplying is continuous and not normal. The cells divide and grow out of control. They may grow into nearby tissue or spread to distant parts of the body. Over time, the mass of cancer cells can get big enough to make lumps (also called masses or tumors) that can be felt or seen.

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  7. www.cancer.net › navigating-cancer-care › cancerWhat is Cancer? | Cancer.Net

    What is Cancer? Approved by the Cancer.Net Editorial Board, 08/2019. Cancer is a group of more than 100 different diseases. It can develop almost anywhere in the body. How cancer begins. Cells are the basic units that make up the human body. Cells grow and divide to make new cells as the body needs them.

  8. www.medicalnewstoday.com › articles › 323708Cancer: Classification, diagnosis, and symptoms

    Nov 16, 2018 · Cancer is a disease that causes cells to divide without stopping, leading to tumor growth and reduced function in the immune system. Many cancers are ultimately fatal if an individual does not...

    • Rachel Nall, MSN, CRNA

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  10. www.livescience.com › cancerWhat is cancer? | Live Science

    Sep 28, 2021 · Cancer is an umbrella term for any uncontrolled growth (sometimes called a tumor) in the body that spreads out from where it started. This spreading characteristic makes the tumor malignant,...

  11. medlineplus.gov › cancerCancer: MedlinePlus

    May 18, 2017 · Summary. Cancer begins in your cells, which are the building blocks of your body. Normally, your body forms new cells as you need them, replacing old cells that die. Sometimes this process goes wrong. New cells grow even when you don't need them, and old cells don't die when they should. These extra cells can form a mass called a tumor.

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