“…If we take into account the possibility of transition from an immuno blastic lymphadenopathy to an immunoblastic sarcoma [23], it becomes significant to weigh the possibility of a chronological relationship between the two groups mentioned. In this way it is interesting to comment that in various cases the diagnosis was carried out in patients who had previously been subject to so-called autoimmune disease: rheumatoid arthritis [14,35], Sjogren's syndrome [13], myastenia gravis [21], hemolytic anemia [34], lupus erythematosus [30], This could be considered somewhat more than sheer chance, especially if one takes into account the clinical observations which would make one suggest a possible relationship between a prolonged antigenic stimulation and the development of a nonneoplastic lymphadenopathy and the transi tion from this to a lymphoplasma-reticulum proliferative malignant dis ease [23,27], A third group would consist of those cases in which a predominant in filtration of plasma cells were found, lacking in atypia or even without it, but with malignant features due to effacing of the normal lymph node structure [24,26]. It should be noted that 2 patients died from plasma cell leukemia [30,34], As regards the immunochemical diagnosis of the abnormal protein, it must be stressed that in spite of its high concentration, the electrophoresis of the serum did not disclose any M-component, because the abnormal y-protein had an a2-globulin mobility and was confused with the usual as pect of this fraction, although it was increased.…”