[Plasma cells leukaemia, cryoglobulins and antithrombin (author's transl)].

Although primitive plasma cells leukaemia is uncommon, it still stands in a particular place among malignant lymphoplasmocytary syndroms. It borrows from multiple myeloma and acute leukaemia some of its clinical and biological manifestations. Its course is quickly adverse, its treatment ineffective and the average life expectation is three months.