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Cancer is a worldwide health problem composed of a class of diseases or disorders characterized by uncontrolled division of cells. The ability of these cells to spread, either by direct growth into adjacent tissue through invasion, or by implantation into distant sites by metastasis (where cancer cells are transported through the bloodstream or lymphatic system) affects people of all ages, especially the elderly. Cancer is one of the highest causes of death in developed countries.

There are several types of cancer. The severity of symptoms depends on the character of the malignancy and whether there is metastasis. Histologic examinations of tissue by a pathologist is required to gain a definitive diagnosis. These tissues are usually obtained by biopsy or surgery. Most cancers can be treated and some cured, dependinging on where it is located and the specific type of Cancer. When the Cancer is diagnosed, it is usually treated with a combination of surgery, chemotherapy and radiotherapy. Cancer treatments are becoming more specific for the type of cancer pathology and drugs that target specific cancers already exist for several cancers. The results of Cancer if untreated, may eventually cause illness and death. Although this is not always the case.

About Cancer
The damage to DNA causes unregulated growth that characterizes cancer results in mutations to genes that encode for proteins controlling cell division. A milgnant cell could be derived from many mutation events transforming normal cells caused by radiation, chemicals or physical agents that cause cancer. These are from called carcinogens, or by certain viruses that can insert their DNA into the human genome. Mutations may be passed down from one cell generation to the next as a result of mutations within germ lines. Some carcinogens may also appear to work through non-mutagenic pathways that affect the level of transcription of certain genes without causing genetic mutation.

Many forms of cancer are associated with exposure to environmental factors such as tobacco smoke, radiation, alcohol, and certain viruses. Some risk factors can be avoided or reduced.