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Disease in twins: Do twins have the same health problems?
Dr Michael Murray, a geneticist at the Yale Cancer Centre, says that with a triplet birth and higher multiple births, you can have all identical, all fraternal, or both identical and fraternal, so the risk varies.
He says there are two different categories of genetic cancer risk. "There's what we call monogenic (or single gene) genetic risk, which means that one out of your 20,000 genes can be broken in a way that predisposes you to genetic risk for cancer.
Source: Reader's Digest