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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PLZ RT: 5yr boy going to die soon from cancer. PLZ send CHRISTMAS cards to Noah Blorkman 1141 Fountain View Circle South Lyon MI 48178
stpanther3 (Scott Mullin) Sat, 07 Nov 2009 19:11:35 -0000
PLZ RT: 5yr boy going to die soon from cancer. PLZ send CHRISTMAS cards to Noah Blorkman 1141 Fountain View Circle South Lyon MI 48178
gente, eu tenho cancer mesmo não é brincadera mais eu ja faço tratamento pra isso mais nao tem como tiralo pois é no cerebro, por isso.
muuuka (Murillo Henrique) Sat, 07 Nov 2009 19:11:27 -0000
gente, eu tenho cancer mesmo não é brincadera mais eu ja faço tratamento pra isso mais nao tem como tiralo pois é no cerebro, por isso.
Breast Cancer Prevention and The American Cancer Industry - http://www.cancer-health.info/?p=510
jillyu42 (Jill Yu) Sat, 07 Nov 2009 19:11:17 -0000
Breast Cancer Prevention and The American Cancer Industry - http://www.cancer-health.info/?p=510
@Eyebee rt @drewfromtv Follow me and LIVESTRONG gets 1 M Cancer DOLLARS help me reach1 m followers by 12/31/09 help save a life
gauntlent (Barry Hunt) Sat, 07 Nov 2009 19:11:08 -0000
@Eyebee rt @drewfromtv Follow me and LIVESTRONG gets 1 M Cancer DOLLARS help me reach1 m followers by 12/31/09 help save a life
US healthcare battle turns nasty: US neglecting cancer patients? Lebanon, Pennsylvania - "One day God is going .. http://bit.ly/2NrQmF
IsabellaBlog (Isabella) Sat, 07 Nov 2009 19:11:08 -0000
US healthcare battle turns nasty: US neglecting cancer patients? Lebanon, Pennsylvania - "One day God is going .. http://bit.ly/2NrQmF
RT @McDreamyBiker another #Cancerwarrior raising @bubblybex:Pls RT my fundraising link for cancer research http://bit.ly/HZfeW good luck Bex
EllenplsTweet (Ellen Pompeo Fans) Sat, 07 Nov 2009 19:11:07 -0000
RT @McDreamyBiker another #Cancerwarrior raising @bubblybex:Pls RT my fundraising link for cancer research http://bit.ly/HZfeW good luck Bex

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