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The cause of chronic lymphocytic leukaemia (CLL) is not known, but research is going on all the time to try to find this out. Like other leukaemias, it is not infectious and cannot be passed on to other people.
In some cases – about one in 10 – other people in your family also have CLL. This is known as familial CLL. If you know that other family members have CLL, it is important to let your specialist know. It is not yet known why this occurs, but research is trying to find this out.
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