Abstract
The expression of the T6 antigen on malignant lymphoid cells has been considered strong evidence in support of T-cell lineage and thymic stage of differentiation of the neoplastic cells. Thus, the authors have used the T6 monoclonal antibody for the last three years in the immunophenotyping of blasts from 60 consecutive cases of acute lymphocytic leukemia (ALL) and 8 cases of T-cell lymphoma. Blasts from 12 of 46 (26%) cases of common type ALL, 4 of 7 (57%) cases of T-cell ALL, 2 of 3 (66%) cases of lymphoblastic lymphoma, and 1 of 5 (20%) cases of peripheral (postthymic) T-cell lymphoma were positive for the T6 antigen. The authors conclude that the expression of T6 antigen on malignant lymphoid cells may not always indicate T-cell lineage.
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