Abstract

Patients with acute non-lymphoblastic leukaemia were studied to determine if the presence of Ia-like antigens on leukaemic cells was related to the maturity of a leukaemic cell line. Ia-like antigens were present in the majority of acute myeloblastic and myelomoblastic leukaemias. 4 patients with acute promyelocytic leukaemia were Ia-negative. This finding suggests that Ia-like antigens reflect normal differentiation linked events in haemopoiesis. The presence of Ia-like antigens on leukaemic cells did not alter the patient's response to chemotherapy.

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