Abstract:
:We conducted a phase 1 study of an anti-CD33 immunotoxin, humanized monoclonal antibody M195 conjugated to recombinant gelonin (HUM-195/rGEL), in patients with relapsed, refractory myeloid leukemias. Twenty-eight patients received the construct intravenously at four dose levels (12, 18, 28 and 40 mg/m(2) per course) in a "3+3" study design. The dose-limiting toxicity was infusion-related allergic reaction including hypoxia and hypotension. The 28 mg/m(2) total dose was considered the maximally tolerated dose. Four patients developed a reduction in peripheral blood blasts of at least 50%. Three patients treated with the 10, 12 and 28 mg/m(2) doses showed a 38-50% reduction in bone marrow blasts. There was normalization of platelets in one patient treated with 40 mg/m(2). Pharmacokinetic analysis demonstrated that the highest blood levels achieved were 200-300 ng/mL which cleared with a half-life of ∼20 hours. Antigenicity was low with one patient at the 12 mg/m(2) dose and one patient at the 18 mg/m(2) dose (2/23, <10%) developing antibodies to the recombinant gelonin component after 28 days. We concluded that HUM-195/rGel can be safely administered in a multi-dose cycle to patients with advanced myeloid malignancies and warrants further investigation.
journal_name
Haematologicajournal_title
Haematologicaauthors
Borthakur G,Rosenblum MG,Talpaz M,Daver N,Ravandi F,Faderl S,Freireich EJ,Kadia T,Garcia-Manero G,Kantarjian H,Cortes JEdoi
10.3324/haematol.2012.071092subject
Has Abstractpub_date
2013-02-01 00:00:00pages
217-21issue
2eissn
0390-6078issn
1592-8721pii
haematol.2012.071092journal_volume
98pub_type
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