Cancer: The Causes Of Cancer And Cancer

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Cancer is not one disease, but it is a large group of almost 100 diseases. It is characterized by uncontrolled growth of the cells in the human body and by the ability of these cells to migrate from the original site and spread to other sites. If cancer spread is not controlled, it may leads to death. Normal cells divide into new cells, then die in an orderly fashion. During the first years of a person’s life, normal cells divide faster, and after becoming an adult, cells divide to replace worn-out or dying cells or to repair damages. Cancer begins when cells start uncontrolled growth. Cancer cell growth is different from normal cell growth. Despite of dying, cancer cells grow and form new cells. Cancer cells can also invade tissues, while normal cells cannot. Cancer is a disease of genes. A gene is a small part of DNA, which is the most important molecule of the cell. Genes make "proteins" which are the ultimate workhorses of the cells. These proteins allow human bodies to carry out all processes such as breathing, thinking and moving. Many genes produce proteins which are involved in controlling the cell growth and division. An alteration to the DNA molecule can disrupt the genes and produce false proteins. This make become abnormal and lose its restraints on growth. The abnormal cell begins to form a new growth known as a "tumor" or neoplasm. In a healthy individual, the immune system can

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