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AIMS: To determine whether myeloid proliferation was monoclonal or polyclonal in a woman with chronic neutrophilic leukaemia and myeloma. METHODS: The X-linked probe, M27 beta was used to determine the clonality of the neutrophil population by analysis of restriction fragment length polymorphisms and X inactivation pattern. RESULTS: A polyclonal pattern of X inactivation was obtained for the neutrophil population in this patient. CONCLUSION: The myeloid expansion in chronic neutrophilic leukaemia associated with myeloma represents a polyclonal reactive response to the plasma cell clone rather than a co-existent myeloproliferative disorder.
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Standen et al. (1993) studied this question.
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