What is cancer? What is the definition of Cancer? and What are the types of cancer? What causes cancer? This time we will discuss these things. Cancer is a term used for diseases in which abnormal cells divide without control and can invade other tissues. Cancer cells can spread to other parts of the body through the blood and lymph systems.
Cancer is not just one disease but many diseases. There are over 100 different types of cancer. Most cancers are named for the organ or cell type in which they start - for example, cancer that begins in the colon is called colon cancer: Cancer that begins in basal cells of the skin is called basal cell carcinoma.
Types of cancer can be grouped into broader categories. The main categories of cancer include:
- Carcinoma - cancer that begins in the skin or in tissues that line or cover internal organs.
- Leukemia - cancer that starts in blood-forming tissue such as bone marrow and causes large numbers of abnormal blood cells are produced and enter the blood.
- Sarcoma - cancer that begins in bone, cartilage, fat, muscle, blood vessels, or other connective or supporting tissue.
- Central nervous system cancers - cancers that begin in brain tissue and spinal cord.
- Lymphoma and myeloma - cancers that begin in cells of the immune system.
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