Cancer tends to be caused by a variety of factors, including environmental ones, diet, lifestyle, etc. Genes is definately a factor involved in cancer, some forms more than others, but it is not the only factor, so it is not a sure thing just because cancer is in your family you will get it also.
Like many other diseases, cancer can be caused by lots of different factors – your environment, your lifestyle, and sometimes just bad luck. However, about 5-10% of cancers are inherited. Note that this doesn’t mean that the cancer itself is inherited. What is inherited is the abnormal gene that causes the cancer, which can be passed down from generation to generation.
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