cancer

Cancer (English: malignant neoplasm) is a group of diseases characterized by typical cell cycle abnormalities that cause the cells ability to:

* Attacked the nearby biological tissue.
* Migrate to other body tissues through blood circulation or lymphatic system, called metastasis.

Abnormalities of the cell cycle, among other things, upon the passage:

* G1 phase into S phase [1]

In general, cancer cells form a tumor, but, like leukemia, do not.

Uncontrolled growth is caused by damage to DNA, causing mutations in vital genes that control cell division. Some fruit mutation may be required to change normal cells into cancer cells. These mutations are often caused by chemical or physical agents called carcinogens. Mutations can occur spontaneously (obtained) or inherited (germline mutations). Cancer can cause many different symptoms, depending on its location and character of the malignancy and whether there is metastasis. A decisive diagnosis usually requires microscopic examination of tissue obtained by biopsy. Once diagnosed, cancer is usually treated with surgery, chemotherapy, or radiation.

If untreated, most cancers cause death, cancer is one of the main causes of death in developing countries. Most cancers can be treated and many cured, especially if treatment starts early. Many forms of cancer associated with environmental factors that could have been avoided. Tobacco smoking can cause cancer than many other environmental factors.

Tumors (Latin; swelling) appoint an abnormal tissue mass, but can be a "malignant" (cancerous) or "benign" (not cancerous). Only malignant tumors are capable of attacking other networks or metastasize. Cancer can spread through the lymph nodes or blood vessels to other organs.