Which factors have something to do with the occurrence of the cancer

The occurrence of the cancer is the complicated biology process of a many factor, many steps, it since include an outside factor, also involve heredity to wait an internal factor.
1, the outside source cancer-causing factor include a chemistry, living creature and physics factor
(1)chemistry carcinogen:Include formaldehyde, alkane to turn medicine;Dense wreath Fang hydrocarbon in the coal tar, asphalt and fuel waste gas;Second nitric An in the pickle food;Crystallize Huo and asbestos;Metal and type metal;Smoke, spread etc. habit article;Food of warmly solve an outcome;Fragrant An;Some hormones, cell toxicity medicine.
(2)living creature carcinogen:Include some fungis, virus, parasite, and germ...etc., like B liver and C liver virus, mankind the nipple lump Luo rod bacteria, DNA and RNA virus in the virus, You door and mankind immunity blemish virus etc..
(3)physical cancer-causing factor:Include an electricity to leave radiation, ultraviolet ray and fiber and foreign body incitement, hot radiation, long term machine burning sex stimulate, creations etc..
2, inside the source cancer-causing factor include environment inside the machine bodies, such as heredity, endocrine and immunity, nourishment and spirit and personality...etc..
(1)original cancer gene:The original cancer gene is existed to mankind in the middle of the cell a type of proper gene, they are to participate in a cell growth to divide of regulate gene.When the original cancer gene is subjected to an outside factor function but activates, will become the cancer gene of having the activity.
(2)suppress cancer gene:Any can directly or indirectly repress cell to increase to living, the cancer change, cancer gradually or the cancer transfer of gene, all be called to suppress cancer gene.Suppressing the cancer gene can is divided into 2 types:One is the outcome that suppresses cancer gene with the outcome direct function of original cancer gene.That type of gene can not go against to terminate cell to increase to living and make the cell divided to terminate, decrepitude, death.Two is the expression that suppresses cancer gene to the original cancer gene is negative to regulate a function.That type of gene ability is able to go against sex of terminate a cell growth.Suppress cancer gene to throw to lose, variation or lose to live cell of the expression of original cancer gene or tumor virus gene will lose to repress, the result cell will present a malignant growth.
(3)family history:The cancer family history increment suffers from cancerous danger.A class relatives' suffering from a cancer history is important and dangerous factor.