The paper deals with a combined case of hairy cell leukemia and lymphoplasmacytic lymphoma with IgMK paraprotein secretion. The use of anti-CD antibody microarray enabled the simultaneous assessment of immunophenotype as well as morphological and cytochemical analysis. Small populations of hairy (3 % of total lymphocyte count) and plasma (2 %) cells including Mott cells (0.2 %) were found in the peripheral blood of a patient with leukopenia. The results obtained by the anti-CD antibody microarray method speeded up provisional diagnosis which was later confirmed by standard diagnostic methods.
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