Cancer is a group of diseases characterized by cells hostile Aggressive ( which grow and divide without limits ) , and the ability of these cells divided Invasion invasion and destruction of adjacent tissues , or move to distant tissues in a process we call metastasis . These capabilities are the characteristics of a malignant tumor on the opposite benign tumor , which is characterized by the growth of a specific inability to invasion and has no ability to move or transport . It can also evolved adenoma to malignant cancer in some cases.
Can cancer that affects all ages in humans even fetuses , but it increases the risk of infection whenever human progress in age. [1] and the cause of cancer death by 13 % of all deaths . [2] indicates community cancer American ACS to the death of 7.6 million people cancer patient in the world in 2007 . [3] also affects the forms of human cancer from infecting animals and plants alike.
Mostly attributable turning healthy cells into cancerous cells to changes in the genetic material / gene . These changes may cause carcinogenic factors such as smoking , or radiation or chemicals or infectious diseases ( Kalasabh viruses ) . There are also encouraging factors for the occurrence of cancer , such as an error or a random mutation in the DNA copy of DNA when the cell division , or because of inheritance of this error or mutation from the mother cell .
Changes occur or genetic mutations in two genes :
Tumor genes : a gene active in the case of a cancer cell to give the new cell characteristics , such as excessive growth and division in abundance , and provide protection against apoptosis ( programmed cell death ) Apoptosis, and help the cancer cell to grow in unusual circumstances .
Genes that inhibit tumor : the genes are stopped in the case of a cancer cell because it opposes configured by correcting any errors in copying DNA , and monitor cell division , and is working on a fusion of the cells and the lack of movement , it also helps the immune system to protect the fabric.
All are classified by type of cancer that arises from tissue cancer ( cancer Place Location) and the nearest cell sound is similar to the cell tumor ( cancer Histologih Histology). Determines the final diagnosis of the situation infected by checking specialist pathology or biopsy sample taken Biopsy of the tumor , although the possibility of the onset of symptoms of malignant tumor or seen by radiography Radiographic.
At present treatment is most cancers may be cured , and this depends on the type of cancer, its location, and stage . When cancer is detected , begins treated with surgery or chemotherapy Surgery Chemotherapy and radiotherapy Radiotherapy. Thanks to developments in research , might produce drugs able to target cancer cells to distinguish them at the molecular level , which reduces the possibility of targeting healthy cells .
