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Why was sick a Cancer person

The five theories that explain why a person is sick
cancer
MAY BE CAUSED BY A VIRUS
now know more firmly than the virus of hepatitis B and C can cause liver tumors and that certain strains of HPV cause cervical cancer. That the HTLV-1-relative of HIV is linked to leukemia. And the Epstein-Barr virus might be associated with certain forms of lymphoma and / or leukemia.
MAY BE CAUSED BY A GENE THAT IS ACTIVATED BY X-RAY
This theory emerged in 1969 and was nominated by two Americans, Robert Huebner and George Todaro. Later research by other scientists led to the discovery that there are mutated forms of genes that can induce change of normal cells into cancer cells.
GENES MAY BE CAUSED BY FAILURE AND CANCER THAT MAKE PROGRESS
In 1984, he was also gaining ground the theory of "tumor suppressor genes, that if they fail, they can stop the cancer progresses. As it is called RB1, associated with cases of retinoblastoma.
MAY BE TRANSMITTED GENETIC WAY
This theory emerged in the nineties, by which it is postulated that there is a cascade of events that combine mutations in certain genes and the absence or inactivation of tumor suppressor genes. This tragic combination can be fired by the consumption of snuff, a fat diets and excess UV radiation, among other factors.
THEORY THE FLASH
Earlier this decade, it was discovered that the microenvironment needed to help cells reproduce and form a tumor. Thus, there appeared the theory of inflammation, which plays a central role the immune system (yes, it defends against bacteria and viruses). You can generate a response in the form of inflammation that can promote or prevent tumor growth.