Abstract
The genome of human T-cell leukemia virus (HTLV) was surveyed in fresh tumor cells of 163 patients with lymphoma and leukemia from the southwest part of Japan where adult T-cell leukemia (ATL) is endemic. Leukemic cells of all 88 cases of ATL tested so far were found to contain the provirus genome and also found to be monoclonal with respect to the integration site of provirus genome. In most cases of ATL, leukemic cells contained one or two copies of the complete HTLV provirus genome, and it was shown that the single species of HTLV with a fully determined sequence is typical in ATL. Some cases of T-cell malignancies, diagnosed as chronic lymphocytic leukemia or non-Hodgkin lymphoma, also had the provirus genome in their tumor cells, whereas some cases with the same diagnosis did not. No cases of other types of lymphoma or leukemia contained the provirus genome in their tumor cells. Monoclonal integration of the HTLV provirus genome in all primary tumor cells of ATL not only indicates that HTLV directly interacts with target cells, which become leukemic, and that integration of the provirus genome is a prerequisite for development of ATL and possibly other related diseases but also indicates that the virus is not associated with other types of lymphoma or leukemia.
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