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Josejavier alejos 9th “A” The environment, the main cause of cancer most of the genetic mutations that produce cancer are not inherited. Instead, they are caused by our environments. The good news is that this means most cancers are preventable. The roles of smoking and radiation are the most common causes of cancer. The radiation is mostly cause by the reduction of the ozone in earth´s atmosphere ,that allows more UV (ultra violet) radiation to reach earth´s surface. Types of cancer can be hereditable It is now believed that cancer is caused by genetic mutation most often, by a series of mutations, some of may be inherited. To test this hypothesis, researchers have put a variety of oncogenes into mice, using promoters to direct the genes to specific tissues. In this way, HHMI investigator Philip Leder and his co-workers at Harvard created and patented "onco-mice“ animals that reliably develop breast and lymph cancers. Onco-mice are being used worldwide to test drugs and therapies against those two forms of cancer. (www.hhmi.org/gentictrial/g110.html Some people are more likely to develop certain cancers ,because they have inherted mutations in cancer – related genes. Such as the example of the chapter24 of the women with BRCA (breast cancer). How many mutant genes are required to produce cancer? A mutation in a single gene is not enough to produce cancer. Mutations in many important genes are required. Why does cancer tends to strike older people? Because mutations have had more time to build up in thier cells.