回复: 预防癌症的十项注意。。。。。。
A cell needs to have a number of mistakes in its genetic code before it becomes cancerous. Doctors call these mistakes faults or mutations. Most of these
gene mutations develop during our lifetime. They can occur due to substances we come into contact with that cause cancer. Or they can happen because of mistakes that cells make when copying their genetic code before dividing into two new cells.
Most of these abnormal cells die or are killed off by your immune system. It usually takes many years to gather enough genetic mistakes, so this is one of the reasons that cancer is generally more common as we get older.
But it is possible to be born with a gene fault that may increase the risk of cancer. This doesn't mean you will definitely get cancer. But it means that you are more likely to develop cancer than the average person.