This is the first attempt to systematically record haematological malignancies in Northern Ireland. The methods are identical to a similar effort in other parts of the UK, except that an independent cross check with a cancer registry source was not possible. In addition problems with the census may create differences. Generally, the rates for the leukaemias are slightly lower than in England and Wales, except for acute lymphoblastic leukaemia whilst non-Hodgkin's lymphoma rates are higher. It remains to be seen how stable this situation is as further data are accumulated
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