Cancer is a class of diseases or disorders characterized by uncontrolled division of cells and the ability of these cells to invade other tissues, either by direct growth into adjacent tissue through invasion or by implantation into distant sites by metastasis. Metastasis is defined as the stage in which cancer cells are transported through the bloodstream or lymphatic system. Cancer may affect people at all ages, but risk tends to increase with age. It is one of the leading causes of death in developed countries.

There are many types of cancer. Severity of symptoms depends on the site and character of the malignancy and whether there is metastasis. A definitive diagnosis usually requires the histologic examination of tissue by a pathologist. This tissue is obtained by biopsy or surgery. Most cancers can be treated and some cured, depending on the specific type, location, and stage. Once diagnosed, cancer is usually treated with a combination of surgery, chemotherapy and radiotherapy. As research develops, treatments are becoming more specific for the type of cancer pathology. Drugs that target specific cancers already exist for several cancers. If untreated, cancers may eventually cause illness and death, though this is not always the case.

The unregulated growth that characterizes cancer is caused by damage to DNA, resulting in mutations to genes that encode for proteins controlling cell division. Many mutation events may be required to transform a normal cell into a malignant cell. These mutations can be caused by chemicals or physical agents called carcinogens, by close exposure to radioactive materials, or by certain viruses that can insert their DNA into the human genome. Mutations occur spontaneously, or are passed down generations as a result of germ line mutations.

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localtrials (US Clinical Trials ) Tue, 15 Dec 2009 00:14:47 -0000
erlotinib prior 2 surgery in ppl w/ head & neck cancer http://bit.ly/8znZzb
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DrugstoreOnline (Pharmacy) Tue, 15 Dec 2009 00:14:46 -0000
DrugstoreOnline Physical Activity May Prolong Survival After Colon Cancer: MONDAY, Dec. 14 -- Exercise appears to r... http://bit.ly/5ex8CI
You are more than ready to go back to work today and may have ... More for Cancer http://twittascope.com/twittascope/?sign=4
jendejoin (Jennifer DeJoinville) Tue, 15 Dec 2009 00:14:42 -0000
You are more than ready to go back to work today and may have ... More for Cancer http://twittascope.com/twittascope/?sign=4
and cancer could go fuck its self!!!!!!!!!
ErikaPancake (Erika Calderon) Tue, 15 Dec 2009 00:14:36 -0000
and cancer could go fuck its self!!!!!!!!!
How much melted-plastic smoke can someone inhale before they get cancer? I sort of need an answer right now.
NinjaStu (afuller) Tue, 15 Dec 2009 00:14:36 -0000
How much melted-plastic smoke can someone inhale before they get cancer? I sort of need an answer right now.
When Lowering the Odds of Cancer Isn’t Enough - http://bit.ly/8ln3Jr
adamslisa (Lisa Adams) Tue, 15 Dec 2009 00:14:34 -0000
When Lowering the Odds of Cancer Isn’t Enough - http://bit.ly/8ln3Jr

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