Summary
The lymphoblasts from 100 patients with acute lymphocytic leukaemia were investigated for the expression of receptors for sheep erythrocytes (E) and of a specific heterologous T cell antigen (T). In 17 cases, both T cell markers were expressed simultaneously on the leukaemic cells. In 13 cases only T antigens could be demonstrated on the lymphoblasts. A quantitative analysis of T antigens by immunoautoradiography revealed that the T expression of E−T+-lymphoblasts was in general like that of E+T+-lymphocytes in the blood of normal persons, in several cases even higher. Therefore, the failure of E-rosette formation cannot be correlated to a decrease of the other T cell differentiation marker. In 7 out of 9 tested cases, a strong acid phosphatase reaction product located paranuclearly could be demonstrated. Complement-receptors were expressed in 3 of 5 cases which were also demonstrated in some cases of the E+T+-ALL group. The latter group was characterized by a T antigen expression like that of thymocytes. 4 cases of the E−T+ALL group were adults. Since the leukaemia cells of 2 cases were negative for acid phosphatase, PAS and all surface markers including cALL antigen, the T antigen can classify undifferentiated and otherwise unclassificable leukaemias. The clinical significance of the E−T+-ALL seems to be important since 5 out of 9 children with this type of ALL died soon after diagnosis.
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Unterstützt von der Deutschen Forschungsgemeinschaft, Studie im Rahmen des Assoziations-vertrages Euratom/GSF Nr. 217-76-1 BIOD
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Thiel, E., Rodt, H., Netzel, B. et al. T-Zell-Antigen positive, E-Rosetten negative akute Lymphoblastenleukämie. Blut 36, 363–369 (1978). https://doi.org/10.1007/BF01000595
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DOI: https://doi.org/10.1007/BF01000595