Acute lymphocytic leukemia and complement receptors. (A study of 45 cases).

The expression of complement receptors (C3R) associated or not to sheep erythrocyte receptors (ER) and surface membrane immunoglobulins (SmIg) was determined on lymphoblasts of 45 patients with acute lymphocyte leukemia (ALL) at onset and/or in the first relapse. We found C3R simultaneously expressed with ER or SmIg on lymphoblasts of T cell ALL and B cell ALL. Lymphoblasts were positive for C3R in absence of ER and SmIg only in three patients in the hematological relapse. We stress the importance to find C3R as independent marker on ALL cells at onset and in subsequent relapses.