Efficacy of the Anti-CD22 Recombinant Immunotoxin BL22 in Chemotherapy-Resistant Hairy-Cell Leukemia
Robert J. Kreitman, M.D., Wyndham H. Wilson, M.D., Ph.D., Karen Bergeron, R.N., Miranda Raggio, R.N., Maryalice Stetler-Stevenson, M.D., David J. FitzGerald, Ph.D., and Ira Pastan, M.D.
Background Hairy-cell leukemia that is resistant to treatmentwith purine analogues, including cladribine, has a poor prognosis.We tested the safety and efficacy of an immunotoxin directedagainst a surface antigen that is strongly expressed by leukemichairy cells.
Methods RFB4(dsFv)-PE38 (BL22), a recombinant immunotoxin containingan anti-CD22 variable domain (Fv) fused to truncated pseudomonasexotoxin, was administered in a dose-escalation trial by intravenousinfusion every other day for a total of three doses.
Results Of 16 patients who were resistant to cladribine, 11had a complete remission and 2 had a partial remission withBL22. The three patients who did not have a response receivedlow doses of BL22 or had preexisting toxin-neutralizing antibodies.Of the 11 patients in complete remission, 2 had minimal residualdisease in the bone marrow or blood. During a median follow-upof 16 months (range, 10 to 23), 3 of the 11 patients who hada complete response relapsed and were retreated; all of thesepatients had a second complete remission. In 2 of the 16 patients,a serious but completely reversible hemolyticuremic syndromedeveloped during the second cycle of treatment with BL22. Commontoxic effects included transient hypoalbuminemia and elevatedaminotransferase levels.
Conclusions BL22 can induce complete remissions in patientswith hairy-cell leukemia that is resistant to treatment withpurine analogues.
Source Information
From the Laboratory of Molecular Biology (R.J.K., K.B., D.J.F., I.P.), the Medicine Branch (W.H.W., M.R.), and the Laboratory of Clinical Pathology (M.S.-S.), National Cancer Institute, Bethesda, Md.
Address reprint requests to Dr. Kreitman at the National Cancer Institute, Laboratory of Molecular Biology, Bldg. 37, Rm. 4B27, 37 Convent Dr., MSC 4255, Bethesda, MD 20892, or at kreitmar{at}mail.nih.gov.
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