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Therapy of patients with human T-cell lymphotrophic virus I-induced adult
T-cell leukemia with anti-Tac, a monoclonal antibody to the receptor for
interleukin-2
TA Waldmann, CK Goldman, KF Bongiovanni, SO Sharrow, MP Davey, KB Cease, SJ Greenberg and DL Longo
Metabolism Branch, National Cancer Institute, Bethesda, MD 20892.
Human T-cell lymphotropic virus I (HTLV-I)-induced adult T-cell leukemia
(ATL) cells constitutively express interleukin-2 (IL-2) receptors
identified by the anti-Tac monoclonal antibody (MoAb), whereas normal
resting cells do not. This observation provided the scientific basis for a
trial of intravenous anti-Tac in the treatment of nine patients with ATL.
The patients did not suffer untoward reactions and did not have a reduction
in the normal formed elements of the blood, and only one of the nine
produced antibodies to the anti-Tac MoAb. Three patients had transient
mixed, partial, or complete remissions lasting from 1 to more than 8 months
after anti-Tac therapy, as assessed by routine hematologic tests,
immunofluorescence analysis of circulating cells, and molecular genetic
analysis of HTLV-I provirus integration and of the T-cell receptor gene
rearrangement. The precise mechanism of the antitumor effects is unclear;
however, the use of a MoAb that prevents the interaction of IL-2 with its
receptor on ATL cells provides a rational approach for the treatment of
this malignancy.
Volume 72,
Issue 5,
pp. 1805-1816,
11/01/1988
Copyright © 1988 by The American Society of Hematology

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