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Cancer Edit

A disease of cellular proliferation that is malignant and primary, characterized by uncontrolled cellular proliferation, local cell invasion and metastasis.

For other uses, see Cancer (disambiguation).

Cancer
Synonyms malignant tumor, malignant neoplasm
A coronal CT scan showing a malignant mesothelioma

Legend: → tumor ←, ✱ central pleural effusion, 1 & 3 lungs, 2 spine, 4 ribs, 5 aorta, 6 spleen, 7 & 8 kidneys, 9 liver.

Pronunciation i/ˈkænsər/
Classification and external resources
Specialty Oncology
ICD-10 C00—C97
ICD-9-CM 140—239
DiseasesDB 28843
MedlinePlus 001289
MeSH D009369
[edit on Wikidata]

Cancer is a group of diseases involving abnormal cell growth with the potential to invade or spread to other parts of the body.[1][2] Not all tumors are cancerous; benign tumors do not spread to other parts of the body.[2]Possible signs and symptoms include a lump, abnormal bleeding, prolonged cough, unexplained weight loss and a change in bowel movements.[3] While these symptoms may indicate cancer, they may have other causes.[3] Over 100 types of cancers affect humans.[2]

Tobacco use is the cause of about 22% of cancer deaths.[1] Another 10% is due to obesity, poor diet, lack of physical activity and drinking alcohol.[1][4] Other factors include certain infections, exposure to ionizing radiation and environmental pollutants.[5] In the developing world nearly 

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