Every cell in our body has a specific job to do. When cells die or wear out, they are replaced by new cells. Sometimes, cells will start growing out of control, crowding out the normal cells, leading to dysfunction in that part of the body.
Cancer is caused by genetic changes in the way certain cells function. There are more than 100 types of cancer, which can start in any place in the body. The type of cancer you have is named for the initial site. Sometimes it may spread to other parts of the body; a process called metastasis.
Most cancers form lumps (tumors), although some forms of cancer, such as leukemia, don’t. Tumors can be completely or partially removed and examined (biopsied) to determine if they are non-cancerous (benign) or cancerous (malignant). Risk factors vary according to type of cancer, but are frequently related to repetitive exposure and may include:
The different types of cancer are generally broken upinto five categories which include:
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