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... because the genetic problems that caused the child’s disease are very likely to be present in their own cord blood, most are cured using cord blood from another child, supplied from a newly established Public Cord Blood Bank.
If we never have another child, what use is William's privately stored cord blood then? I think I felt that the private cord blood storage people were banking on possibilities more than actualities. I realise that the technology is advancing all the time but it is an expensive form of insurance if you don't have that certainty of being able to use it some day.
In actual fact, it might be more use than you might think. You are correct in that stored cord blood is not currently of any benefit for the child who donated it, but it could be of great benefit to that child's siblings. Stored cord blood as an approximately 1 in 4 chance of being genetically similar enough to a sibling to be used if that sibling contracts a disease that is treatable with a cord blood transplant. In other words, if we had donated Molly's cord blood, and Olivia then contracted a disease, there would be a 1:4 chance that Molly's cord blood was a genetic match for Olivia. Matched sibling cord blood is one of the best types of stem cell transplants you can have. The ins and outs of genetics means that most parents can at best be only a 50% match to their children (because they each contribute 50% of the child's genes at conception) unless they were already genetically similar before they married (which happens in some close-knit communities). So, in the absence of compatible parents and relatives, siblings are often the best chance of a genetic match, and sibling cord blood can be of great use in that situation.