[Plasma cell beta-glucuronidase and monoclonal gammapathies (author's transl)].

beta-glucuronidase activity, estimated cytochemically, is, in more than half cases of myeloma, very increased or decreased, compared to that found in benign dysglobulinemias, where this activity is normal. A very high or very low score makes sure the diagnostic of myeloma. The relations between the beta-glucuronidase activity and the myeloma clinical stade according to Durie and Salmon and the bone lysis are discussed.