Journal of Clinical Oncology, Vol 15, 1567-1574, Copyright © 1997 by American Society of Clinical Oncology
Phase II multicenter study of human CD52 antibody in previously treated chronic lymphocytic leukemia. European Study Group of CAMPATH-1H Treatment in Chronic Lymphocytic Leukemia
A Osterborg, MJ Dyer, D Bunjes, GA Pangalis, Y Bastion, D Catovsky and H Mellstedt
Department of Oncology (Radiumhemmet), Karolinska Hospital, Stockholm, Sweden. aob@rah.Ks.se
PURPOSE: CAMPATH-1H is a human immunoglobulin G1 (IgG1) anti-CD52
monoclonal antibody (MAb) that binds to nearly all B- and T-cell lymphomas
and leukemias. We report the results of a multicenter phase II trial that
used CAMPATH-1H in previously chemotherapy-treated patients with chronic
lymphocytic leukemia (CLL). MATERIALS AND METHODS: Twenty-nine patients who
had relapsed after an initial response (n = 8) or were refractory (n = 21)
to chemotherapy were treated with CAMPATH-1H administered as a 30-mg 2-hour
intravenous (IV) infusion thrice weekly for a maximum period of 12 weeks.
RESULTS: Eleven patients (38%) achieved a partial remission (PR) and one
(4%) a complete remission (CR) (response rate, 42%; 95% confidence interval
[CI], 23% to 61%). Three of eight patients (38%) with a relapse and nine of
21 refractory patients (43%) responded to CAMPATH-1H therapy. CLL cells
were rapidly eliminated from blood in 28 of 29 patients (97%). CR in the
bone marrow was obtained in 36% and splenomegaly resolved completely in
32%. Lymphadenopathy was normalized in only two patients (7%). The median
response duration was 12 months (range, 6 to 25+). World Health
Organization (WHO) grade IV neutropenia and thrombocytopenia developed in
three (10%) and two patients (7%), respectively. Neutropenia and
thrombocytopenia recovered in most responding patients during continued
CAMPATH-1H treatment. Lymphopenia (< 0.5 x 10(9)/L) occurred in all
patients. Two patients had opportunistic infections and four had bacterial
septicemia. CONCLUSION: CAMPATH-1H had significant activity in patients
with advanced and chemotherapy-resistant CLL. The most pronounced effects
were noted in blood, bone marrow, and spleen. Preferential clearance of
blood may allow harvesting of uncontaminated blood stem cells for use in
high- dose chemotherapy protocols.
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