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(this photo shows how a cancer cell begins to divide and take over the healty normal cells.) - cancer ultimately begins with damage in the DNA - because DNA is like "set instructions" for the cells (telling them when to die and divide and also how and when to grow)... when the DNA is damaged the cells will therefore become damaged as well - often times normal cells with have damaged DNA but they have the ability to repair the mutations in the DNA and if they cant then they die - certain damages in the DNA prevent the cells from being able to repair and become cancerous - mutations can also allow a cell to surpass the normal cell life span - the genetic mutation is only the start of the cancer process - there are a number of different changes that you needinorder to fully develop cancer - mutations are often times caused by forces inside of your body (hormones, viruses, and chronic inflammation) - other mutations cam come from the environment around you (UV light from the sun or cancer-causing chemicals) - promoters cause the cells to divide rapidly ( which could lead to tumors) - promoters can come from a number of places, your genetics, inside your body, or from the environment around you - progressors make cancers more aggressive and are cells are therefore more likely to spread - like initiators and promoters progressors can be inherited or could come from the environment surrounding you - a persons genetics, forces within the body, lifestyle, and environment can aid cancer in forming or can help complete the process of cancer once it has started - if you are born with a genetic mutation you might be more susceptible to developing cancer by a cancer-causing chemical than a person who wasnt born with a genetic mutation
 * **what causes cancer?**
 * an initiator to cause a genetic mutation**
 * -** sometimes you are born with the mutation
 * a promoter to cause rapid cell growth**
 * -** promoters take advantage of genetic mutations
 * a progressor to cause cancer to become aggressive and spread**
 * -** without progressors tumors would remain benign and stay in one place

http://www.mayoclinic.com/health/cancer/CA00003
 * the above information was found at...