"Researchers have long recognized that when cells copy themselves, they sometimes make small errors in the billions of chemical letters that make up their DNA. Many of these mistakes are inconsequential, but others can cause cells to grow out of control. That is the beginning of cancer."

"Why are some types of cancer so much more common than others? Sometimes it’s due to faulty genes inherited from one’s parents and sometimes to behaviors like smoking a pack of cigarettes every day. But in most cases, it comes down to something else – stem cells."

"This is the intriguing argument made by a pair of researchers from Johns Hopkins University. In a study published Friday in the journal Science, they found a very high correlation between the differences in risk for 31 kinds of cancer and the frequency with which different types of stem cells made copies of themselves."

From the +Los Angeles Times: http://ow.ly/GPoIi

Scientists explain how stem cells and ‘bad luck’ cause cancer
Why are some types of cancer so much more common than others? Sometimes it’s due to faulty genes inherited from one’s parents and sometimes to behaviors like smoking a pack of cigarettes every day. But in most cases, it comes down to something else – stem cells.

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