Cancer And Its Effects On Cancer Essay
Cancer is a term used for diseases in which abnormal cells divide without control and are able to 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. Cancer is a variety of diseases that are characterized by uncontrolled cell growth and possible destruction of surrounding normal cells. The International Agency for Research on Cancer has classified some 60 substances and processes as probably or definitely carcinogenic in humans. Some examples are as arsenic, asbestos, ionizing radiation, ultraviolet rays, x rays, and many derivatives of coal tar. Metastatic cancer is cancer that has spread from the place where it first started to another place in the body. A tumor formed by metastatic cancer cells is called a metastatic tumor or a metastasis. The process by which cancer cells spread to other parts of the body is also called metastasis. There are over 100 different types of cancer, and each is classified by the type of cell that is initially affected. More dangerous, or malignant, tumors form when two things occur:
1. a cancerous cell manages to move throughout the body using the blood or lymphatic systems, destroying healthy tissue in a process called invasion
2. that cell manages to divide and grow, making new blood vessels to feed itself in a process called angiogenesis.
Cancer can arise in any part of the body, though some regions seem to be more…