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Cancer

Cancer (medical term: malignant neoplasm) is a class of diseases in which a group of cells display uncontrolled growth (division beyond the normal limits), invasion (intrusion on and destruction of adjacent tissues), and sometimes metastasis (spread to other locations in the body via lymph or blood). These three malignant properties of cancers differentiate them from benign tumors, which are self-limited, do not invade or metastasize. Most cancers form a tumor but some, like leukemia, do not. The branch of medicine concerned with the study, diagnosis, treatment, and prevention of cancer is oncology.

Cancer may affect people at all ages, even fetuses, but the risk for most varieties increases with age.[1] Cancer causes about 13% of all deaths.[2] According to the American Cancer Society, 7.6 million people died from cancer in the world during 2007.[3] Cancers can affect all animals.

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When normal cells are damaged beyond repair, they are eliminated by apoptosis (A). Cancer cells avoid apoptosis and continue to multiply in an unregulated manner (B).

From Wikipedia, the free encyclopedia

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How Does Cancer Spread to Other Parts of the Body?

The cells within malignant tumors have the ability to invade neighboring tissues and organs, thus spreading the disease. It is also possible for cancerous cells to break free from the tumor and enter the blood stream, and spreading the disease to other organs. This process of spreading is called metastasis.

When cancer has metastasized and has affected other areas of the body, the disease is still referred to the organ of origination. For instance, if cervical cancer spreads to the lungs, it is still called cervical cancer, not lung cancer.

Although most cancers develop this way, diseases like leukemia do not. They affect the blood and the organs that form blood and then invade nearby tissues.

All cancers are different, and require different treatment. What may be effective for prostate cancer, probably will not be for bladder cancer. Diagnosing cancer will vary as well, depending on the organ affected.

... From About.com : cancer
Cancer is a complex group of over 100 different types of cancer. Cancer can affect just about every organ in the human body.

How Does Cancer Develop?

The organs in our body are made up of cells. Cells divide and multiply as the body needs them. When these cells continue multiplying when the body doesn't need them, the result is a mass or growth, also called a tumor.

These growths are consider either benign or malignant. Benign is considered non-cancerous and malignant is cancerous.

Benign tumors rarely are life threatening and do not spread to other parts of the body. They can often be removed.

... From About.com : Cancer

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