Immunoblastic lymphosarcoma, a cytological and clinical entity?
We have studied 20 cases of haematosarcomas belonging to lymphosarcomas (T or B-cell markers, absence of the reticulosarcoma characters in sections, on smears, with conventional and scanning electron microscopy). Their cells which appear as large pyroninophilic cells on sections, as large very basophilic cells with blastic nuclei and often cytoplasmic vacuoles on smears, as having many polyribosomes and usually no ergastoplasm with conventional electron microscopy, and as large cells of the lymphocytic series with scanning electron microscopy resemble the cells which we described in adenitis in 1955 (9) and in the graft-versus-host-reaction in 1961 (6), which Gowans (15) showed resulted from lymphocyte transformation, and which Dameshek (10) called immunoblasts. Many of these cases of immunoblastic lymphosarcoma (ILS) identified on their cytohistological characteristics [also recognized by Lukes et al. (24, 25) and Lennert et al. (21, 22)], present aetiological, clinical and pronostic characters which let us suppose that it may be not only a cytological entity but also a cytoclinical entity : a) it affects males in 85% or the subjects; eight patients came from mediterranean countries outside France; two patients had a history of chronic rheumatoid manifestations; b) the disease was at stage IV at the first presentation in 10 patients out of 20; it was revealed by profound (mediastinal or abdominal) localizations in 60% of cases (12 out of 20); it presented a hypoglobulinaemia in eight out of 13 patients; in six out of the 15 patients treated before leukaemic conversion, the chemotherapy usually efficient in lymphosarcoma (LS) failed to induce remission. This type of LS has a poorer prognosis than other types of LS (median for all stages : eight months). It led to the death either after its conversion to leukaemia (nine out of 20 cases), or by vital organ (as brain or kidney) infiltrations.