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Clinical Trials |
Klinik I fuer Innere Medizin, Universitaet zu Koeln, 50924 Koeln, Germany [R. S., O. S., P. B., C. S., B. M., H. H., V. D., A. E.], and Cancer Immunobiology Center, The University of Texas, Southwestern Medical Center, Dallas, Texas 75235 [J. S., V. G., E. S. V.]
Ki-4.dgA is an anti-CD30 immunotoxin (IT) constructedby coupling the monoclonal antibody Ki-4 via a sterically hindered disulfide linker to deglycosylated ricin A-chain. This IT was efficacious in vitro and in SCID mice with disseminated human Hodgkin’s lymphoma. Accordingly, a Phase I trial in patients (pts) with Hodgkin’s lymphoma was designed.
The objectives of this Phase I trial were to determine the maximum tolerated dose, the dose-limiting toxicities, pharmacokinetics, and antitumor activity. Seventeen pts with relapsed CD30+ lymphoma were treated with escalating doses (5, 7.5, or 10 mg/m2/cycle) of the IT as four bolus infusions on days 1, 3, 5, and 7 for one to three cycles. All of the pts had progressive disease and were heavily pretreated. Nine had primary progressive disease and 14 had advanced disease with massive tumor burdens. The mean age was 35 years (24–52 years).
Peak serum concentrations of the intact IT varied from 0.23 to 1.1 µg/ml. Side effects and dose-limiting toxicities were related to vascular leak syndrome, i.e., decreases in serum albumin, edema, weight gain, hypotension, tachycardia, myalgia, and weakness. The maximum tolerated dose was 5 mg/m2. Seven of 17 (40%) pts made human antiricin antibodies (
1.0 µg/ml), and 1 pt developed human antimouse antibodies (1.0 µg/ml). Clinical response in the 15 evaluable pts included 1 partial remission, 1 minor response, and 2 stable diseases.
In conclusion, the IT was less well tolerated than other ITs of this type. This might be because of the low number of CD30+ peripheral blood mononuclear cells, and in part because of binding of the IT to soluble CD30 antigen and the resulting circulation of IT/sCD30 complexes.
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